vim-patch:8.2.{4692,4691,4690}: fix Insert mode <LeftDrag> mapping bug (#17999)

vim-patch:8.2.4692: no test for what 8.2.4691 fixes

Problem:    No test for what 8.2.4691 fixes.
Solution:   Add a test.  Use a more generic sotlution. (closes vim/vim#10090)
https://github.com/vim/vim/commit/0f68e6c07aaf62c034a242f183b93c1bb44e7f93

Test cannot be used because it must use test_setmouse(). Use a Lua test.

Reverted patches:

vim-patch:8.2.4691: solution for <Cmd> in a mapping causes trouble

Problem:    Solution for <Cmd> in a mapping causes trouble.
Solution:   Use another solution: put back CTRL-O after reading the <Cmd>
            sequence.
https://github.com/vim/vim/commit/ca9d8d2cb9fc6b9240f2a74ccd36f9d966488294

vim-patch:8.2.4689: using <Cmd> in a mapping does not work for mouse keys

Problem:    Using <Cmd> in a mapping does not work for mouse keys in Insert
            mode. (Sergey Vlasov)
Solution:   When reading the <Cmd> argument do not use the stuff buffer.
            (closes vim/vim#10080)
https://github.com/vim/vim/commit/d0fb2d804183c2786578b4c32ba5b92938f93d0e

1 files changed, 34 insertions, 0 deletions

diff --git a/src/nvim/testdir/test_mapping.vim b/src/nvim/testdir/test_mapping.vim
index 98440ccdd7..a8dd0ca286 100644
--- a/src/nvim/testdir/test_mapping.vim
+++ b/src/nvim/testdir/test_mapping.vim
@@ -676,4 +676,38 @@ func Test_plug_remap()
   %bw!
 endfunc
 
+" Test for mapping <LeftDrag> in Insert mode
+func Test_mouse_drag_insert_map()
+  CheckFunction test_setmouse
+  set mouse=a
+  func ClickExpr()
+    call test_setmouse(1, 1)
+    return "\<LeftMouse>"
+  endfunc
+  func DragExpr()
+    call test_setmouse(1, 2)
+    return "\<LeftDrag>"
+  endfunc
+  inoremap <expr> <F2> ClickExpr()
+  imap <expr> <F3> DragExpr()
+
+  inoremap <LeftDrag> <LeftDrag><Cmd>let g:dragged = 1<CR>
+  exe "normal i\<F2>\<F3>"
+  call assert_equal(1, g:dragged)
+  call assert_equal('v', mode())
+  exe "normal! \<C-\>\<C-N>"
+  unlet g:dragged
+
+  inoremap <LeftDrag> <LeftDrag><C-\><C-N>
+  exe "normal i\<F2>\<F3>"
+  call assert_equal('n', mode())
+
+  iunmap <LeftDrag>
+  iunmap <F2>
+  iunmap <F3>
+  delfunc ClickExpr
+  delfunc DragExpr
+  set mouse&
+endfunc
+
 " vim: shiftwidth=2 sts=2 expandtab