[vim/vim] Since patch 9.1.1703 Vim sometimes begins in search mode rather than in normal mode when running in Windows Terminal. (Issue #19426)

[Shane Harper]

shaneharper created an issue (vim/vim#19426)

Often, on Ubuntu installed from the Microsoft Store on Windows 11, when I start Vim with:
-c 'runtime! macros/less.vim'
Vim will begin in search mode ('/' displayed in the bottom left) rather than in normal mode.

Running the following seems to almost always result in Vim starting in search mode:
echo . | vim -c 'runtime! macros/less.vim' -u /dev/null -i NONE -

Some miscellaneous details:

• I used git bisect to determine that the problem has existed since 1f51bbc ("Cannot react to terminal OSC responses").
• The problem still exists in Vim v9.2.0010.
• I've been passing:
  -c 'set t_RB='
  to vim as a workaround.
• I've observed the problem when viewing a regular file rather than stdin (although only rarely).
• The problem doesn't seem to occur when using gnome-terminal instead of Windows Terminal.
  Running:
  :echo v:termrbgresp
  I normally get:
  ^[]11;rgb:ffff/ffff/ffff^[
  with Windows Terminal, and:
  ^[]11;rgb:ffff/ffff/ffff^G
  with gnome-terminal.
• I am using Windows Terminal v1.23.20211.0.

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