fix(pum): handle right-click menu repositioning with multigrid (#26975)

src/nvim/popupmenu.c

@@ -58,7 +58,8 @@ static bool pum_rl;                 // true when popupmenu is drawn 'rightleft'
 
 static int pum_anchor_grid;         // grid where position is defined
 static int pum_row;                 // top row of pum
-static int pum_col;                 // left column of pum
+static int pum_col;                 // left column of pum, right column if 'rightleft'
+static int pum_left_col;            // left column of pum, before padding or scrollbar
 static bool pum_above;              // pum is drawn above cursor line
 
 static bool pum_is_visible = false;
@@ -464,14 +465,14 @@ void pum_redraw(void)
 
   grid_assign_handle(&pum_grid);
 
-  bool moved = ui_comp_put_grid(&pum_grid, pum_row, pum_col - col_off,
+  pum_left_col = pum_col - col_off;
+  bool moved = ui_comp_put_grid(&pum_grid, pum_row, pum_left_col,
                                 pum_height, grid_width, false, true);
   bool invalid_grid = moved || pum_invalid;
   pum_invalid = false;
   must_redraw_pum = false;
 
-  if (!pum_grid.chars
+  if (!pum_grid.chars || pum_grid.rows != pum_height || pum_grid.cols != grid_width) {
-      || pum_grid.rows != pum_height || pum_grid.cols != grid_width) {
     grid_alloc(&pum_grid, pum_height, grid_width, !invalid_grid, false);
     ui_call_grid_resize(pum_grid.handle, pum_grid.cols, pum_grid.rows);
   } else if (invalid_grid) {
@@ -480,9 +481,8 @@ void pum_redraw(void)
   if (ui_has(kUIMultigrid)) {
     const char *anchor = pum_above ? "SW" : "NW";
     int row_off = pum_above ? -pum_height : 0;
-    ui_call_win_float_pos(pum_grid.handle, -1, cstr_as_string((char *)anchor),
+    ui_call_win_float_pos(pum_grid.handle, -1, cstr_as_string((char *)anchor), pum_anchor_grid,
-                          pum_anchor_grid, pum_row - row_off, pum_col - col_off,
+                          pum_row - row_off, pum_left_col, false, pum_grid.zindex);
-                          false, pum_grid.zindex);
   }
 
   // Never display more than we have
@@ -1160,7 +1160,14 @@ static void pum_position_at_mouse(int min_width)
       max_col = MAX(Columns - wp->w_wincol, wp->w_grid.cols);
     }
   }
-  pum_anchor_grid = mouse_grid;
+  if (pum_grid.handle != 0 && mouse_grid == pum_grid.handle) {
+    // Repositioning the menu by right-clicking on itself
+    mouse_grid = pum_anchor_grid;
+    mouse_row += pum_row;
+    mouse_col += pum_left_col;
+  } else {
+    pum_anchor_grid = mouse_grid;
+  }
   if (max_row - mouse_row > pum_size) {
     // Enough space below the mouse row.
     pum_above = false;

test/functional/ui/popupmenu_spec.lua

@@ -3770,6 +3770,67 @@ describe('builtin popupmenu', function()
           :let g:menustr = 'b{n: baz }        |
         ]])
       end
+      if multigrid then
+        meths.input_mouse('right', 'press', '', 2, 0, 18)
+        screen:expect {
+          grid = [[
+        ## grid 1
+          [2:--------------------------------]|*5
+          [3:--------------------------------]|
+        ## grid 2
+          ^popup menu test                 |
+          {1:~                               }|*4
+        ## grid 3
+          :let g:menustr = 'bar'          |
+        ## grid 4
+          {n: foo }|
+          {n: bar }|
+          {n: baz }|
+        ]],
+          float_pos = {
+            [4] = { { id = -1 }, 'NW', 2, 1, 17, false, 250 },
+          },
+        }
+      else
+        feed('<RightMouse><18,0>')
+        screen:expect([[
+          ^popup menu test                 |
+          {1:~                }{n: foo }{1:          }|
+          {1:~                }{n: bar }{1:          }|
+          {1:~                }{n: baz }{1:          }|
+          {1:~                               }|
+          :let g:menustr = 'bar'          |
+        ]])
+      end
+      if multigrid then
+        meths.input_mouse('right', 'press', '', 4, 1, 3)
+        screen:expect({
+          grid = [[
+        ## grid 1
+          [2:--------------------------------]|*5
+          [3:--------------------------------]|
+        ## grid 2
+          ^popup menu test                 |
+          {1:~                               }|*4
+        ## grid 3
+          :let g:menustr = 'bar'          |
+        ## grid 4
+          {n: foo }|
+          {n: bar }|
+          {n: baz }|
+        ]],
+          float_pos = { [4] = { { id = -1 }, 'NW', 2, 3, 19, false, 250 } },
+        })
+      else
+        feed('<RightMouse><20,2>')
+        screen:expect([[
+          ^popup menu test                 |
+          {1:~                               }|*2
+          {1:~                  }{n: foo }{1:        }|
+          {1:~                  }{n: bar }{1:        }|
+          :let g:menustr = 'b{n: baz }        |
+        ]])
+      end
       if multigrid then
         meths.input_mouse('left', 'press', '', 4, 2, 2)
         screen:expect({
@@ -3785,7 +3846,7 @@ describe('builtin popupmenu', function()
         ]],
         })
       else
-        feed('<LeftMouse><22,5>')
+        feed('<LeftMouse><21,5>')
         screen:expect([[
           ^popup menu test                 |
           {1:~                               }|*4
@@ -4022,7 +4083,7 @@ describe('builtin popupmenu', function()
         ]],
         })
       else
-        feed('<LeftMouse><22,3>')
+        feed('<LeftMouse><21,3>')
         screen:expect([[
           popup menu test                 |
           {1:~                               }|