fix(editor)!: operator target/cgn modifies Visual marks #42119

Problem:
An operator on a target that creates a Visual selection (`cgn`,
`d<C-v>j`, an omap text object like `:<C-U>normal! viw`) sets `'< '>`,
`gv` and `visualmode()` to the operator target.

This causes at least the following problems:
- clobbers the user's previous `'< '>` (annoying and usually unwanted)
  - E.g. after a custom textobj, `:help text-object-define`.
- "cgn" with a `\%V` pattern can't be dot-repeated (".")

Solution:
Don't save the Visual area if the operator target created it (operator
was pending).

Also fix `an`/`in` with `'selection'=exclusive` starting from an empty
range.

1 files changed, 12 insertions, 4 deletions

diff --git a/runtime/lua/vim/treesitter/_range.lua b/runtime/lua/vim/treesitter/_range.lua
index ab322e8188..1526acb8aa 100644
--- a/runtime/lua/vim/treesitter/_range.lua
+++ b/runtime/lua/vim/treesitter/_range.lua
@@ -186,6 +186,18 @@ function M.visual_select(range)
     end_col = #vim.fn.getline(end_row + 1) + 1
   end
 
+  if vim.o.selection == 'exclusive' then
+    end_col = end_col + 1
+  end
+
+  if not vim.fn.mode():find('^[vV\22]') then
+    -- Operator-pending: select directly, not via "gv", to keep the user's '< '> (|omap-info|).
+    api.nvim_win_set_cursor(0, { start_row + 1, start_col })
+    vim.cmd.normal({ 'v', bang = true })
+    api.nvim_win_set_cursor(0, { end_row + 1, end_col - 1 })
+    return
+  end
+
   if vim.fn.visualmode() ~= 'v' then
     -- Reset visualmode() to 'v'
     vim.cmd.normal({ 'v\27', bang = true })
@@ -198,10 +210,6 @@ function M.visual_select(range)
     cursor_other_end_of_selection = true
   end
 
-  if vim.o.selection == 'exclusive' then
-    end_col = end_col + 1
-  end
-
   vim.fn.setpos("'<", { 0, start_row + 1, start_col + 1, 0 })
   vim.fn.setpos("'>", { 0, end_row + 1, end_col, 0 })