vim-patch:8.2.1781: writing to prompt buffer interferes with insert mode

Problem:    Writing to prompt buffer interferes with insert mode.
Solution:   Use win_enter() instead of just setting "curwin". (Ben Jackson,
            closes vim/vim#7035)
https://github.com/vim/vim/commit/4537bcc88956f86267c25edf8008e0dbde598652

Vim test will be skipped, so add a Lua test.
The problem boils down to the use of aucmd_restbuf in a callback, so just test
that (via nvim_buf_set_lines).

1 files changed, 13 insertions, 1 deletions

diff --git a/test/functional/legacy/prompt_buffer_spec.lua b/test/functional/legacy/prompt_buffer_spec.lua
index 513be807be..a987eaf12c 100644
--- a/test/functional/legacy/prompt_buffer_spec.lua
+++ b/test/functional/legacy/prompt_buffer_spec.lua
@@ -1,9 +1,12 @@
 local helpers = require('test.functional.helpers')(after_each)
 local Screen = require('test.functional.ui.screen')
-local feed= helpers.feed
+local feed = helpers.feed
 local source = helpers.source
 local clear = helpers.clear
 local feed_command = helpers.feed_command
+local poke_eventloop = helpers.poke_eventloop
+local meths = helpers.meths
+local eq = helpers.eq
 
 describe('prompt buffer', function()
   local screen
@@ -150,4 +153,13 @@ describe('prompt buffer', function()
     ]])
   end)
 
+  it('keeps insert mode after aucmd_restbuf in callback', function()
+    source [[
+      let s:buf = nvim_create_buf(1, 1)
+      call timer_start(0, {-> nvim_buf_set_lines(s:buf, -1, -1, 0, ['walrus'])})
+      startinsert
+    ]]
+    poke_eventloop()
+    eq({ mode = "i", blocking = false }, meths.get_mode())
+  end)
 end)