paste: workaround typeahead race

Workaround this failure:

    [  ERROR   ] test/functional/terminal/tui_spec.lua @ 192: TUI paste: exactly 64 bytes
    test/functional/helpers.lua:403:
    retry() attempts: 478
    test/functional/terminal/tui_spec.lua:201: Expected objects to be the same.
    Passed in:
    (table: 0x47cd77e8) {
     *[1] = 'zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz endz' }
    Expected:
    (table: 0x47cd7830) {
     *[1] = 'zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz end' }

This happens because `curwin->w_cursor.col` is sometimes decremented at
the end of `do_put`... because the editor is in Normal-mode instead of
the expected Insert-mode.

Caused by "typeahead race" (#10826): there may be queued input in the
main thread not yet processed, thus the editor mode (`State` global)
will be "wrong" during paste. Example: input "i" followed immediately by
a paste sequence:

    i<start-paste>...<stop-paste>
    ^
     "i" does not get processed in time, so the editor is in
     Normal-mode instead of Insert-mode while handling the paste.

Attempted workarounds:
- vim.api.nvim_feedkeys('','x',false) in vim._paste()
- exec_normal() in tinput_wait_enqueue()
- LOOP_PROCESS_EVENTS(&main_loop,…,0) in tinput_wait_enqueue()

ref #10826

0 files changed, 0 insertions, 0 deletions