fix(api): more intuitive cursor updates in nvim_buf_set_text

Fixes #22526

runtime/doc/api.txt

@@ -2438,6 +2438,8 @@ nvim_buf_set_text({buffer}, {start_row}, {start_col}, {end_row}, {end_col},
     Prefer |nvim_buf_set_lines()| if you are only adding or deleting entire
     lines.
 
+    Prefer |nvim_put()| if you want to insert text at the cursor position.
+
     Attributes: ~
         not allowed when |textlock| is active
 
@@ -2451,6 +2453,7 @@ nvim_buf_set_text({buffer}, {start_row}, {start_col}, {end_row}, {end_col},
 
     See also: ~
       • |nvim_buf_set_lines()|
+      • |nvim_put()|
 
 nvim_buf_set_var({buffer}, {name}, {value})               *nvim_buf_set_var()*
     Sets a buffer-scoped (b:) variable

runtime/lua/vim/_meta/api.lua

@@ -621,6 +621,7 @@ function vim.api.nvim_buf_set_option(buffer, name, value) end
 --- range, use `replacement = {}`.
 --- Prefer `nvim_buf_set_lines()` if you are only adding or deleting entire
 --- lines.
+--- Prefer `nvim_put()` if you want to insert text at the cursor position.
 ---
 --- @param buffer integer Buffer handle, or 0 for current buffer
 --- @param start_row integer First line index

runtime/lua/vim/lsp/util.lua

@@ -454,23 +454,6 @@ function M.apply_text_edits(text_edits, bufnr, offset_encoding)
     end
   end)
 
-  -- Some LSP servers are depending on the VSCode behavior.
-  -- The VSCode will re-locate the cursor position after applying TextEdit so we also do it.
-  local is_current_buf = api.nvim_get_current_buf() == bufnr or bufnr == 0
-  local cursor = (function()
-    if not is_current_buf then
-      return {
-        row = -1,
-        col = -1,
-      }
-    end
-    local cursor = api.nvim_win_get_cursor(0)
-    return {
-      row = cursor[1] - 1,
-      col = cursor[2],
-    }
-  end)()
-
   -- save and restore local marks since they get deleted by nvim_buf_set_lines
   local marks = {}
   for _, m in pairs(vim.fn.getmarklist(bufnr or vim.api.nvim_get_current_buf())) do
@@ -480,7 +463,6 @@ function M.apply_text_edits(text_edits, bufnr, offset_encoding)
   end
 
   -- Apply text edits.
-  local is_cursor_fixed = false
   local has_eol_text_edit = false
   for _, text_edit in ipairs(text_edits) do
     -- Normalize line ending
@@ -527,20 +509,6 @@ function M.apply_text_edits(text_edits, bufnr, offset_encoding)
       e.end_col = math.min(last_line_len, e.end_col)
 
       api.nvim_buf_set_text(bufnr, e.start_row, e.start_col, e.end_row, e.end_col, e.text)
-
-      -- Fix cursor position.
-      local row_count = (e.end_row - e.start_row) + 1
-      if e.end_row < cursor.row then
-        cursor.row = cursor.row + (#e.text - row_count)
-        is_cursor_fixed = true
-      elseif e.end_row == cursor.row and e.end_col <= cursor.col then
-        cursor.row = cursor.row + (#e.text - row_count)
-        cursor.col = #e.text[#e.text] + (cursor.col - e.end_col)
-        if #e.text == 1 then
-          cursor.col = cursor.col + e.start_col
-        end
-        is_cursor_fixed = true
-      end
     end
   end
 
@@ -560,16 +528,6 @@ function M.apply_text_edits(text_edits, bufnr, offset_encoding)
     end
   end
 
-  -- Apply fixed cursor position.
-  if is_cursor_fixed then
-    local is_valid_cursor = true
-    is_valid_cursor = is_valid_cursor and cursor.row < max
-    is_valid_cursor = is_valid_cursor and cursor.col <= #(get_line(bufnr, cursor.row) or '')
-    if is_valid_cursor then
-      api.nvim_win_set_cursor(0, { cursor.row + 1, cursor.col })
-    end
-  end
-
   -- Remove final line if needed
   local fix_eol = has_eol_text_edit
   fix_eol = fix_eol and (vim.bo[bufnr].eol or (vim.bo[bufnr].fixeol and not vim.bo[bufnr].binary))

src/nvim/api/buffer.c

@@ -504,7 +504,10 @@ end:
 ///
 /// Prefer |nvim_buf_set_lines()| if you are only adding or deleting entire lines.
 ///
+/// Prefer |nvim_put()| if you want to insert text at the cursor position.
+///
 /// @see |nvim_buf_set_lines()|
+/// @see |nvim_put()|
 ///
 /// @param channel_id
 /// @param buffer           Buffer handle, or 0 for current buffer
@@ -725,13 +728,14 @@ void nvim_buf_set_text(uint64_t channel_id, Buffer buffer, Integer start_row, In
 
   FOR_ALL_TAB_WINDOWS(tp, win) {
     if (win->w_buffer == buf) {
-      // adjust cursor like an extmark ( i e it was inside last_part_len)
-      if (win->w_cursor.lnum == end_row && win->w_cursor.col > end_col) {
-        win->w_cursor.col -= col_extent - (colnr_T)last_item.size;
-      }
+      if (win->w_cursor.lnum >= start_row && win->w_cursor.lnum <= end_row) {
+        fix_cursor_cols(win, (linenr_T)start_row, (colnr_T)start_col, (linenr_T)end_row,
+                        (colnr_T)end_col, (linenr_T)new_len, (colnr_T)last_item.size);
+      } else {
         fix_cursor(win, (linenr_T)start_row, (linenr_T)end_row, (linenr_T)extra);
       }
     }
+  }
 
 end:
   for (size_t i = 0; i < new_len; i++) {
@@ -1339,6 +1343,79 @@ static void fix_cursor(win_T *win, linenr_T lo, linenr_T hi, linenr_T extra)
   invalidate_botline(win);
 }
 
+/// Fix cursor position after replacing text
+/// between (start_row, start_col) and (end_row, end_col).
+///
+/// win->w_cursor.lnum is assumed to be >= start_row and <= end_row.
+static void fix_cursor_cols(win_T *win, linenr_T start_row, colnr_T start_col, linenr_T end_row,
+                            colnr_T end_col, linenr_T new_rows, colnr_T new_cols_at_end_row)
+{
+  colnr_T mode_col_adj = win == curwin && (State & MODE_INSERT) ? 0 : 1;
+
+  colnr_T end_row_change_start = new_rows == 1 ? start_col : 0;
+  colnr_T end_row_change_end = end_row_change_start + new_cols_at_end_row;
+
+  // check if cursor is after replaced range or not
+  if (win->w_cursor.lnum == end_row && win->w_cursor.col + mode_col_adj > end_col) {
+    // if cursor is after replaced range, it's shifted
+    // to keep it's position the same, relative to end_col
+
+    linenr_T old_rows = end_row - start_row + 1;
+    win->w_cursor.lnum += new_rows - old_rows;
+    win->w_cursor.col += end_row_change_end - end_col;
+  } else {
+    // if cursor is inside replaced range
+    // and the new range got smaller,
+    // it's shifted to keep it inside the new range
+    //
+    // if cursor is before range or range did not
+    // got smaller, position is not changed
+
+    colnr_T old_coladd = win->w_cursor.coladd;
+
+    // it's easier to work with a single value here.
+    // col and coladd are fixed by a later call
+    // to check_cursor_col_win when necessary
+    win->w_cursor.col += win->w_cursor.coladd;
+    win->w_cursor.coladd = 0;
+
+    linenr_T new_end_row = start_row + new_rows - 1;
+
+    // make sure cursor row is in the new row range
+    if (win->w_cursor.lnum > new_end_row) {
+      win->w_cursor.lnum = new_end_row;
+
+      // don't simply move cursor up, but to the end
+      // of new_end_row, if it's not at or after
+      // it already (in case virtualedit is active)
+      // column might be additionally adjusted below
+      // to keep it inside col range if needed
+      colnr_T len = (colnr_T)strlen(ml_get_buf(win->w_buffer, new_end_row));
+      if (win->w_cursor.col < len) {
+        win->w_cursor.col = len;
+      }
+    }
+
+    // if cursor is at the last row and
+    // it wasn't after eol before, move it exactly
+    // to end_row_change_end
+    if (win->w_cursor.lnum == new_end_row
+        && win->w_cursor.col > end_row_change_end && old_coladd == 0) {
+      win->w_cursor.col = end_row_change_end;
+
+      // make sure cursor is inside range, not after it,
+      // except when doing so would move it before new range
+      if (win->w_cursor.col - mode_col_adj >= end_row_change_start) {
+        win->w_cursor.col -= mode_col_adj;
+      }
+    }
+  }
+
+  check_cursor_col_win(win);
+  changed_cline_bef_curs(win);
+  invalidate_botline(win);
+}
+
 /// Initialise a string array either:
 /// - on the Lua stack (as a table) (if lstate is not NULL)
 /// - as an API array object (if lstate is NULL).

test/functional/api/buffer_spec.lua

@@ -848,6 +848,710 @@ describe('api/buf', function()
       eq({1, 4}, meths.win_get_cursor(win2))
     end)
 
+    describe('when text is being added right at cursor position #22526', function()
+      it('updates the cursor position in NORMAL mode', function()
+        insert([[
+        abcd]])
+
+        -- position the cursor on 'c'
+        curwin('set_cursor', {1, 2})
+        -- add 'xxx' before 'c'
+        set_text(0, 2, 0, 2, {'xxx'})
+        eq({'abxxxcd'}, get_lines(0, -1, true))
+        -- cursor should be on 'c'
+        eq({1, 5}, curwin('get_cursor'))
+      end)
+
+      it('updates the cursor position only in non-current window when in INSERT mode', function()
+        insert([[
+        abcd]])
+
+        -- position the cursor on 'c'
+        curwin('set_cursor', {1, 2})
+        -- open vertical split
+        feed('<c-w>v')
+        -- get into INSERT mode to treat cursor
+        -- as being after 'b', not on 'c'
+        feed('i')
+        -- add 'xxx' between 'b' and 'c'
+        set_text(0, 2, 0, 2, {'xxx'})
+        eq({'abxxxcd'}, get_lines(0, -1, true))
+        -- in the current window cursor should stay after 'b'
+        eq({1, 2}, curwin('get_cursor'))
+        -- quit INSERT mode
+        feed('<esc>')
+        -- close current window
+        feed('<c-w>c')
+        -- in another window cursor should be on 'c'
+        eq({1, 5}, curwin('get_cursor'))
+      end)
+    end)
+
+    describe('when text is being deleted right at cursor position', function()
+      it('leaves cursor at the same position in NORMAL mode', function()
+        insert([[
+        abcd]])
+
+        -- position the cursor on 'b'
+        curwin('set_cursor', {1, 1})
+        -- delete 'b'
+        set_text(0, 1, 0, 2, {})
+        eq({'acd'}, get_lines(0, -1, true))
+        -- cursor is now on 'c'
+        eq({1, 1}, curwin('get_cursor'))
+      end)
+
+      it('leaves cursor at the same position in INSERT mode in current and non-current window', function()
+        insert([[
+        abcd]])
+
+        -- position the cursor on 'b'
+        curwin('set_cursor', {1, 1})
+        -- open vertical split
+        feed('<c-w>v')
+        -- get into INSERT mode to treat cursor
+        -- as being after 'a', not on 'b'
+        feed('i')
+        -- delete 'b'
+        set_text(0, 1, 0, 2, {})
+        eq({'acd'}, get_lines(0, -1, true))
+        -- cursor in the current window should stay after 'a'
+        eq({1, 1}, curwin('get_cursor'))
+        -- quit INSERT mode
+        feed('<esc>')
+        -- close current window
+        feed('<c-w>c')
+        -- cursor in non-current window should stay on 'c'
+        eq({1, 1}, curwin('get_cursor'))
+      end)
+    end)
+
+    describe('when cursor is inside replaced row range', function()
+      it('keeps cursor at the same position if cursor is at start_row, but before start_col', function()
+        insert([[
+        This should be first
+        then there is a line we do not want
+        and finally the last one]])
+
+        -- position the cursor on ' ' before 'first'
+        curwin('set_cursor', {1, 14})
+
+        set_text(0, 15, 2, 11, {
+          'the line we do not want',
+          'but hopefully',
+        })
+
+        eq({
+          'This should be the line we do not want',
+          'but hopefully the last one',
+        }, get_lines(0, -1, true))
+        -- cursor should stay at the same position
+        eq({1, 14}, curwin('get_cursor'))
+      end)
+
+      it('keeps cursor at the same position if cursor is at start_row and column is still valid', function()
+        insert([[
+        This should be first
+        then there is a line we do not want
+        and finally the last one]])
+
+        -- position the cursor on 'f' in 'first'
+        curwin('set_cursor', {1, 15})
+
+        set_text(0, 15, 2, 11, {
+          'the line we do not want',
+          'but hopefully',
+        })
+
+        eq({
+          'This should be the line we do not want',
+          'but hopefully the last one',
+        }, get_lines(0, -1, true))
+        -- cursor should stay at the same position
+        eq({1, 15}, curwin('get_cursor'))
+      end)
+
+      it('adjusts cursor column to keep it valid if start_row got smaller', function()
+        insert([[
+        This should be first
+        then there is a line we do not want
+        and finally the last one]])
+
+        -- position the cursor on 't' in 'first'
+        curwin('set_cursor', {1, 19})
+
+        local cursor = exec_lua([[
+          vim.api.nvim_buf_set_text(0, 0, 15, 2, 24, {'last'})
+          return vim.api.nvim_win_get_cursor(0)
+        ]])
+
+        eq({ 'This should be last' }, get_lines(0, -1, true))
+        -- cursor should end up on 't' in 'last'
+        eq({1, 18}, curwin('get_cursor'))
+        -- immediate call to nvim_win_get_cursor should have returned the same position
+        eq({1, 18}, cursor)
+      end)
+
+      it('adjusts cursor column to keep it valid if start_row got smaller in INSERT mode', function()
+        insert([[
+        This should be first
+        then there is a line we do not want
+        and finally the last one]])
+
+        -- position the cursor on 't' in 'first'
+        curwin('set_cursor', {1, 19})
+        -- enter INSERT mode to treat cursor as being after 't'
+        feed('a')
+
+        local cursor = exec_lua([[
+          vim.api.nvim_buf_set_text(0, 0, 15, 2, 24, {'last'})
+          return vim.api.nvim_win_get_cursor(0)
+        ]])
+
+        eq({ 'This should be last' }, get_lines(0, -1, true))
+        -- cursor should end up after 't' in 'last'
+        eq({1, 19}, curwin('get_cursor'))
+        -- immediate call to nvim_win_get_cursor should have returned the same position
+        eq({1, 19}, cursor)
+      end)
+
+      it('adjusts cursor column to keep it valid in a row after start_row if it got smaller', function()
+        insert([[
+        This should be first
+        then there is a line we do not want
+        and finally the last one]])
+
+        -- position the cursor on 'w' in 'want'
+        curwin('set_cursor', {2, 31})
+
+        local cursor = exec_lua([[
+          vim.api.nvim_buf_set_text(0, 0, 15, 2, 11, {
+            '1',
+            'then 2',
+            'and then',
+          })
+          return vim.api.nvim_win_get_cursor(0)
+        ]])
+
+        eq({
+          'This should be 1',
+          'then 2',
+          'and then the last one',
+        }, get_lines(0, -1, true))
+        -- cursor column should end up at the end of a row
+        eq({2, 5}, curwin('get_cursor'))
+        -- immediate call to nvim_win_get_cursor should have returned the same position
+        eq({2, 5}, cursor)
+      end)
+
+      it('adjusts cursor column to keep it valid in a row after start_row if it got smaller in INSERT mode', function()
+        insert([[
+        This should be first
+        then there is a line we do not want
+        and finally the last one]])
+
+        -- position the cursor on 'w' in 'want'
+        curwin('set_cursor', {2, 31})
+        -- enter INSERT mode
+        feed('a')
+
+        local cursor = exec_lua([[
+          vim.api.nvim_buf_set_text(0, 0, 15, 2, 11, {
+            '1',
+            'then 2',
+            'and then',
+          })
+          return vim.api.nvim_win_get_cursor(0)
+        ]])
+
+        eq({
+          'This should be 1',
+          'then 2',
+          'and then the last one',
+        }, get_lines(0, -1, true))
+        -- cursor column should end up at the end of a row
+        eq({2, 6}, curwin('get_cursor'))
+        -- immediate call to nvim_win_get_cursor should have returned the same position
+        eq({2, 6}, cursor)
+      end)
+
+      it('adjusts cursor line and column to keep it inside replacement range', function()
+        insert([[
+        This should be first
+        then there is a line we do not want
+        and finally the last one]])
+
+        -- position the cursor on 'n' in 'finally'
+        curwin('set_cursor', {3, 6})
+
+        local cursor = exec_lua([[
+          vim.api.nvim_buf_set_text(0, 0, 15, 2, 11, {
+            'the line we do not want',
+            'but hopefully',
+          })
+          return vim.api.nvim_win_get_cursor(0)
+        ]])
+
+        eq({
+          'This should be the line we do not want',
+          'but hopefully the last one',
+        }, get_lines(0, -1, true))
+        -- cursor should end up on 'y' in 'hopefully'
+        -- to stay in the range, because it got smaller
+        eq({2, 12}, curwin('get_cursor'))
+        -- immediate call to nvim_win_get_cursor should have returned the same position
+        eq({2, 12}, cursor)
+      end)
+
+      it('adjusts cursor line and column if replacement is empty', function()
+        insert([[
+        This should be first
+        then there is a line we do not want
+        and finally the last one]])
+
+        -- position the cursor on 'r' in 'there'
+        curwin('set_cursor', {2, 8})
+
+        local cursor = exec_lua([[
+          vim.api.nvim_buf_set_text(0, 0, 15, 2, 12, {})
+          return vim.api.nvim_win_get_cursor(0)
+        ]])
+
+        eq({ 'This should be the last one' }, get_lines(0, -1, true))
+        -- cursor should end up on the next column after deleted range
+        eq({1, 15}, curwin('get_cursor'))
+        -- immediate call to nvim_win_get_cursor should have returned the same position
+        eq({1, 15}, cursor)
+      end)
+
+      it('adjusts cursor line and column if replacement is empty and start_col == 0', function()
+        insert([[
+        This should be first
+        then there is a line we do not want
+        and finally the last one]])
+
+        -- position the cursor on 'r' in 'there'
+        curwin('set_cursor', {2, 8})
+
+        local cursor = exec_lua([[
+          vim.api.nvim_buf_set_text(0, 0, 0, 2, 4, {})
+          return vim.api.nvim_win_get_cursor(0)
+        ]])
+
+        eq({ 'finally the last one' }, get_lines(0, -1, true))
+        -- cursor should end up in column 0
+        eq({1, 0}, curwin('get_cursor'))
+        -- immediate call to nvim_win_get_cursor should have returned the same position
+        eq({1, 0}, cursor)
+      end)
+
+      it('adjusts cursor column if replacement ends at cursor row, after cursor column', function()
+        insert([[
+        This should be first
+        then there is a line we do not want
+        and finally the last one]])
+
+        -- position the cursor on 'y' in 'finally'
+        curwin('set_cursor', {3, 10})
+        set_text(0, 15, 2, 11, { '1', 'this 2', 'and then' })
+
+        eq({
+          'This should be 1',
+          'this 2',
+          'and then the last one',
+        }, get_lines(0, -1, true))
+        -- cursor should end up on 'n' in 'then'
+        eq({3, 7}, curwin('get_cursor'))
+      end)
+
+      it('adjusts cursor column if replacement ends at cursor row, at cursor column in INSERT mode', function()
+        insert([[
+        This should be first
+        then there is a line we do not want
+        and finally the last one]])
+
+        -- position the cursor on 'y' at 'finally'
+        curwin('set_cursor', {3, 10})
+        -- enter INSERT mode to treat cursor as being between 'l' and 'y'
+        feed('i')
+        set_text(0, 15, 2, 11, { '1', 'this 2', 'and then' })
+
+        eq({
+          'This should be 1',
+          'this 2',
+          'and then the last one',
+        }, get_lines(0, -1, true))
+        -- cursor should end up after 'n' in 'then'
+        eq({3, 8}, curwin('get_cursor'))
+      end)
+
+      it('adjusts cursor column if replacement is inside of a single line', function()
+        insert([[
+        This should be first
+        then there is a line we do not want
+        and finally the last one]])
+
+        -- position the cursor on 'y' in 'finally'
+        curwin('set_cursor', {3, 10})
+        set_text(2, 4, 2, 11, { 'then' })
+
+        eq({
+          'This should be first',
+          'then there is a line we do not want',
+          'and then the last one',
+        }, get_lines(0, -1, true))
+        -- cursor should end up on 'n' in 'then'
+        eq({3, 7}, curwin('get_cursor'))
+      end)
+
+      it('does not move cursor column after end of a line', function()
+        insert([[
+        This should be the only line here
+        !!!]])
+
+        -- position cursor on the last '1'
+        curwin('set_cursor', {2, 2})
+
+        local cursor = exec_lua([[
+          vim.api.nvim_buf_set_text(0, 0, 33, 1, 3, {})
+          return vim.api.nvim_win_get_cursor(0)
+        ]])
+
+        eq({ 'This should be the only line here' }, get_lines(0, -1, true))
+        -- cursor should end up on '!'
+        eq({1, 32}, curwin('get_cursor'))
+        -- immediate call to nvim_win_get_cursor should have returned the same position
+        eq({1, 32}, cursor)
+      end)
+
+      it('does not move cursor column before start of a line', function()
+        insert('\n!!!')
+
+        -- position cursor on the last '1'
+        curwin('set_cursor', {2, 2})
+
+        local cursor = exec_lua([[
+          vim.api.nvim_buf_set_text(0, 0, 0, 1, 3, {})
+          return vim.api.nvim_win_get_cursor(0)
+        ]])
+
+        eq({ '' }, get_lines(0, -1, true))
+        -- cursor should end up on '!'
+        eq({1, 0}, curwin('get_cursor'))
+        -- immediate call to nvim_win_get_cursor should have returned the same position
+        eq({1, 0}, cursor)
+      end)
+
+      describe('with virtualedit', function()
+        it('adjusts cursor line and column to keep it inside replacement range if cursor is not after eol', function()
+          insert([[
+          This should be first
+          then there is a line we do not want
+          and finally the last one]])
+
+          -- position cursor on 't' in 'want'
+          curwin('set_cursor', {2, 34})
+          -- turn on virtualedit
+          command('set virtualedit=all')
+
+          local cursor = exec_lua([[
+            vim.api.nvim_buf_set_text(0, 0, 15, 2, 11, {
+              'the line we do not want',
+              'but hopefully',
+            })
+            return vim.api.nvim_win_get_cursor(0)
+          ]])
+
+          eq({
+            'This should be the line we do not want',
+            'but hopefully the last one',
+          }, get_lines(0, -1, true))
+          -- cursor should end up on 'y' in 'hopefully'
+          -- to stay in the range
+          eq({2, 12}, curwin('get_cursor'))
+          -- immediate call to nvim_win_get_cursor should have returned the same position
+          eq({2, 12}, cursor)
+          -- coladd should be 0
+          eq(0, exec_lua([[
+            return vim.fn.winsaveview().coladd
+          ]]))
+        end)
+
+        it('does not change cursor screen column when cursor is after eol and row got shorter', function()
+          insert([[
+          This should be first
+          then there is a line we do not want
+          and finally the last one]])
+
+          -- position cursor on 't' in 'want'
+          curwin('set_cursor', {2, 34})
+          -- turn on virtualedit
+          command('set virtualedit=all')
+          -- move cursor after eol
+          exec_lua([[
+            vim.fn.winrestview({ coladd = 5 })
+          ]])
+
+          local cursor = exec_lua([[
+            vim.api.nvim_buf_set_text(0, 0, 15, 2, 11, {
+              'the line we do not want',
+              'but hopefully',
+            })
+            return vim.api.nvim_win_get_cursor(0)
+          ]])
+
+          eq({
+            'This should be the line we do not want',
+            'but hopefully the last one',
+          }, get_lines(0, -1, true))
+          -- cursor should end up at eol of a new row
+          eq({2, 26}, curwin('get_cursor'))
+          -- immediate call to nvim_win_get_cursor should have returned the same position
+          eq({2, 26}, cursor)
+          -- coladd should be increased so that cursor stays in the same screen column
+          eq(13, exec_lua([[
+            return vim.fn.winsaveview().coladd
+          ]]))
+        end)
+
+        it('does not change cursor screen column when cursor is after eol and row got longer', function()
+          insert([[
+          This should be first
+          then there is a line we do not want
+          and finally the last one]])
+
+          -- position cursor on 't' in 'first'
+          curwin('set_cursor', {1, 19})
+          -- turn on virtualedit
+          command('set virtualedit=all')
+          -- move cursor after eol
+          exec_lua([[
+            vim.fn.winrestview({ coladd = 21 })
+          ]])
+
+          local cursor = exec_lua([[
+            vim.api.nvim_buf_set_text(0, 0, 15, 2, 11, {
+              'the line we do not want',
+              'but hopefully',
+            })
+            return vim.api.nvim_win_get_cursor(0)
+          ]])
+
+          eq({
+            'This should be the line we do not want',
+            'but hopefully the last one',
+          }, get_lines(0, -1, true))
+          -- cursor should end up at eol of a new row
+          eq({1, 38}, curwin('get_cursor'))
+          -- immediate call to nvim_win_get_cursor should have returned the same position
+          eq({1, 38}, cursor)
+          -- coladd should be increased so that cursor stays in the same screen column
+          eq(2, exec_lua([[
+            return vim.fn.winsaveview().coladd
+          ]]))
+        end)
+
+        it('does not change cursor screen column when cursor is after eol and row extended past cursor column', function()
+          insert([[
+          This should be first
+          then there is a line we do not want
+          and finally the last one]])
+
+          -- position cursor on 't' in 'first'
+          curwin('set_cursor', {1, 19})
+          -- turn on virtualedit
+          command('set virtualedit=all')
+          -- move cursor after eol just a bit
+          exec_lua([[
+            vim.fn.winrestview({ coladd = 3 })
+          ]])
+
+          local cursor = exec_lua([[
+            vim.api.nvim_buf_set_text(0, 0, 15, 2, 11, {
+              'the line we do not want',
+              'but hopefully',
+            })
+            return vim.api.nvim_win_get_cursor(0)
+          ]])
+
+          eq({
+            'This should be the line we do not want',
+            'but hopefully the last one',
+          }, get_lines(0, -1, true))
+          -- cursor should stay at the same screen column
+          eq({1, 22}, curwin('get_cursor'))
+          -- immediate call to nvim_win_get_cursor should have returned the same position
+          eq({1, 22}, cursor)
+          -- coladd should become 0
+          eq(0, exec_lua([[
+            return vim.fn.winsaveview().coladd
+          ]]))
+        end)
+
+        it('does not change cursor screen column when cursor is after eol and row range decreased', function()
+          insert([[
+          This should be first
+          then there is a line we do not want
+          and one more
+          and finally the last one]])
+
+          -- position cursor on 'e' in 'more'
+          curwin('set_cursor', {3, 11})
+          -- turn on virtualedit
+          command('set virtualedit=all')
+          -- move cursor after eol
+          exec_lua([[
+            vim.fn.winrestview({ coladd = 28 })
+          ]])
+
+          local cursor = exec_lua([[
+            vim.api.nvim_buf_set_text(0, 0, 15, 3, 11, {
+              'the line we do not want',
+              'but hopefully',
+            })
+            return vim.api.nvim_win_get_cursor(0)
+          ]])
+
+          eq({
+            'This should be the line we do not want',
+            'but hopefully the last one',
+          }, get_lines(0, -1, true))
+          -- cursor should end up at eol of a new row
+          eq({2, 26}, curwin('get_cursor'))
+          -- immediate call to nvim_win_get_cursor should have returned the same position
+          eq({2, 26}, cursor)
+          -- coladd should be increased so that cursor stays in the same screen column
+          eq(13, exec_lua([[
+            return vim.fn.winsaveview().coladd
+          ]]))
+        end)
+      end)
+    end)
+
+    describe('when cursor is at end_row and after end_col', function()
+      it('adjusts cursor column when only a newline is added or deleted', function()
+        insert([[
+        first line
+        second
+         line]])
+
+        -- position the cursor on 'i'
+        curwin('set_cursor', {3, 2})
+        set_text(1, 6, 2, 0, {})
+        eq({'first line', 'second line'}, get_lines(0, -1, true))
+        -- cursor should stay on 'i'
+        eq({2, 8}, curwin('get_cursor'))
+
+        -- add a newline back
+        set_text(1, 6, 1, 6, {'', ''})
+        eq({'first line', 'second', ' line'}, get_lines(0, -1, true))
+        -- cursor should return back to the original position
+        eq({3, 2}, curwin('get_cursor'))
+      end)
+
+      it('adjusts cursor column if the range is not bound to either start or end of a line', function()
+        insert([[
+        This should be first
+        then there is a line we do not want
+        and finally the last one]])
+
+        -- position the cursor on 'h' in 'the'
+        curwin('set_cursor', {3, 13})
+        set_text(0, 14, 2, 11, {})
+        eq({'This should be the last one'}, get_lines(0, -1, true))
+        -- cursor should stay on 'h'
+        eq({1, 16}, curwin('get_cursor'))
+        -- add deleted lines back
+        set_text(0, 14, 0, 14, {
+          ' first',
+          'then there is a line we do not want',
+          'and finally',
+        })
+        eq({
+          'This should be first',
+          'then there is a line we do not want',
+          'and finally the last one',
+        }, get_lines(0, -1, true))
+        -- cursor should return back to the original position
+        eq({3, 13}, curwin('get_cursor'))
+      end)
+
+      it('adjusts cursor column if replacing lines in range, not just deleting and adding', function()
+        insert([[
+        This should be first
+        then there is a line we do not want
+        and finally the last one]])
+
+        -- position the cursor on 's' in 'last'
+        curwin('set_cursor', {3, 18})
+        set_text(0, 15, 2, 11, {
+          'the line we do not want',
+          'but hopefully',
+        })
+
+        eq({
+          'This should be the line we do not want',
+          'but hopefully the last one',
+        }, get_lines(0, -1, true))
+        -- cursor should stay on 's'
+        eq({2, 20}, curwin('get_cursor'))
+
+        set_text(0, 15, 1, 13, {
+          'first',
+          'then there is a line we do not want',
+          'and finally',
+        })
+
+        eq({
+          'This should be first',
+          'then there is a line we do not want',
+          'and finally the last one',
+        }, get_lines(0, -1, true))
+        -- cursor should return back to the original position
+        eq({3, 18}, curwin('get_cursor'))
+      end)
+
+      it('does not move cursor column after end of a line', function()
+        insert([[
+        This should be the only line here
+        ]])
+
+        -- position cursor at the empty line
+        curwin('set_cursor', {2, 0})
+
+        local cursor = exec_lua([[
+          vim.api.nvim_buf_set_text(0, 0, 33, 1, 0, {'!'})
+          return vim.api.nvim_win_get_cursor(0)
+        ]])
+
+        eq({ 'This should be the only line here!' }, get_lines(0, -1, true))
+        -- cursor should end up on '!'
+        eq({1, 33}, curwin('get_cursor'))
+        -- immediate call to nvim_win_get_cursor should have returned the same position
+        eq({1, 33}, cursor)
+      end)
+
+      it('does not move cursor column before start of a line', function()
+        insert('\n')
+
+        eq({ '', '' }, get_lines(0, -1, true))
+
+        -- position cursor on the last '1'
+        curwin('set_cursor', {2, 2})
+
+        local cursor = exec_lua([[
+          vim.api.nvim_buf_set_text(0, 0, 0, 1, 0, {''})
+          return vim.api.nvim_win_get_cursor(0)
+        ]])
+
+        eq({ '' }, get_lines(0, -1, true))
+        -- cursor should end up on '!'
+        eq({1, 0}, curwin('get_cursor'))
+        -- immediate call to nvim_win_get_cursor should have returned the same position
+        eq({1, 0}, cursor)
+      end)
+    end)
+
     it('can handle NULs', function()
       set_text(0, 0, 0, 0, {'ab\0cd'})
       eq('ab\0cd', curbuf_depr('get_line', 0))

test/functional/plugin/lsp_spec.lua

@@ -1787,7 +1787,7 @@ describe('LSP', function()
         eq({
           'First line of text';
         }, buf_lines(1))
-        eq({ 1, 6 }, funcs.nvim_win_get_cursor(0))
+        eq({ 1, 17 }, funcs.nvim_win_get_cursor(0))
       end)
 
       it('fix the cursor row', function()