fix(diagnostic): escape special chars in file names (#16588)

runtime/lua/vim/diagnostic.lua

@@ -655,7 +655,10 @@ function M.set(namespace, bufnr, diagnostics, opts)
 
   vim.api.nvim_buf_call(bufnr, function()
     vim.api.nvim_command(
-      string.format("doautocmd <nomodeline> DiagnosticChanged %s", vim.api.nvim_buf_get_name(bufnr))
+      string.format(
+        "doautocmd <nomodeline> DiagnosticChanged %s",
+        vim.fn.fnameescape(vim.api.nvim_buf_get_name(bufnr))
+      )
     )
   end)
 end
@@ -1339,7 +1342,10 @@ function M.reset(namespace, bufnr)
   end
 
   vim.api.nvim_command(
-      string.format("doautocmd <nomodeline> DiagnosticChanged %s", vim.api.nvim_buf_get_name(bufnr))
+    string.format(
+      "doautocmd <nomodeline> DiagnosticChanged %s",
+      vim.fn.fnameescape(vim.api.nvim_buf_get_name(bufnr))
+    )
   )
 end
 

test/functional/lua/diagnostic_spec.lua

@@ -1932,5 +1932,27 @@ describe('vim.diagnostic', function()
         return {show_called, hide_called}
       ]])
     end)
+
+    it('triggers the autocommand when diagnostics are set', function()
+      eq(1, exec_lua [[
+        vim.g.diagnostic_autocmd_triggered = 0
+        vim.cmd('autocmd DiagnosticChanged * let g:diagnostic_autocmd_triggered = 1')
+        vim.api.nvim_buf_set_name(diagnostic_bufnr, "test | test")
+        vim.diagnostic.set(diagnostic_ns, diagnostic_bufnr, {
+          make_error('Diagnostic', 0, 0, 0, 0)
+        })
+        return vim.g.diagnostic_autocmd_triggered
+      ]])
+      end)
+
+    it('triggers the autocommand when diagnostics are cleared', function()
+      eq(1, exec_lua [[
+        vim.g.diagnostic_autocmd_triggered = 0
+        vim.cmd('autocmd DiagnosticChanged * let g:diagnostic_autocmd_triggered = 1')
+        vim.api.nvim_buf_set_name(diagnostic_bufnr, "test | test")
+        vim.diagnostic.reset(diagnostic_ns, diagnostic_bufnr)
+        return vim.g.diagnostic_autocmd_triggered
+      ]])
+      end)
   end)
 end)