Problem: No generic way to trigger an autocommand on mode change.
Solution: Add the ModeChanged autocommand event. (Magnus Gross, closesvim/vim#8856)
f1e8876fa2
N/A patches for version.c:
vim-patch:8.2.3434: function prototype for trigger_modechanged() is incomplete
Problem: Function prototype for trigger_modechanged() is incomplete.
Solution: Add "void".
28e591dd50Fixes#4399.
Fixes#7416.