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, 26 insertions, 0 deletions

diff --git a/test/functional/legacy/mapping_spec.lua b/test/functional/legacy/mapping_spec.lua
index 92a757ca85..aa29698589 100644
--- a/test/functional/legacy/mapping_spec.lua
+++ b/test/functional/legacy/mapping_spec.lua
@@ -3,6 +3,8 @@
 local helpers = require('test.functional.helpers')(after_each)
 local clear, feed, insert = helpers.clear, helpers.feed, helpers.insert
 local feed_command, expect, poke_eventloop = helpers.feed_command, helpers.expect, helpers.poke_eventloop
+local command, eq, eval, meths = helpers.command, helpers.eq, helpers.eval, helpers.meths
+local sleep = helpers.sleep
 
 describe('mapping', function()
   before_each(clear)
@@ -126,4 +128,28 @@ describe('mapping', function()
       new line here
       ]])
   end)
+
+  it('<LeftDrag> mapping in Insert mode works correctly vim-patch:8.2.4692', function()
+    command('set mouse=a')
+
+    command([[inoremap <LeftDrag> <LeftDrag><Cmd>let g:dragged = 1<CR>]])
+    feed('i')
+    sleep(10)
+    meths.input_mouse('left', 'press', '', 0, 0, 0)
+    sleep(10)
+    meths.input_mouse('left', 'drag', '', 0, 0, 1)
+    sleep(10)
+    eq(1, eval('g:dragged'))
+    eq('v', eval('mode()'))
+    feed([[<C-\><C-N>]])
+
+    command([[inoremap <LeftDrag> <LeftDrag><C-\><C-N>]])
+    feed('i')
+    sleep(10)
+    meths.input_mouse('left', 'press', '', 0, 0, 0)
+    sleep(10)
+    meths.input_mouse('left', 'drag', '', 0, 0, 1)
+    sleep(10)
+    eq('n', eval('mode()'))
+  end)
 end)