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, 2 insertions, 1 deletions

diff --git a/runtime/lua/vim/treesitter/_select.lua b/runtime/lua/vim/treesitter/_select.lua
index afdd1a7612..6708e6292f 100644
--- a/runtime/lua/vim/treesitter/_select.lua
+++ b/runtime/lua/vim/treesitter/_select.lua
@@ -356,7 +356,8 @@ local function get_selection()
     pos1, pos2 = pos2, pos1
   end
 
-  if vim.o.selection == 'exclusive' then
+  -- selection=exclusive excludes end char, except for empty selection (op-pending, or a new "v").
+  if vim.o.selection == 'exclusive' and (pos1[2] ~= pos2[2] or pos1[3] ~= pos2[3]) then
     pos2[3] = pos2[3] - 1
   end