fix(events): trigger WinScrolled when only skipcol changed
vim-patch:9.0.0304: WinScrolled is not triggered when only skipcol changes
Problem: WinScrolled is not triggered when only skipcol changes.
Solution: Add w_last_skipcol and use it. (closesvim/vim#10998)
670ab0334b
Problem: Accessing freed memory after WinScrolled autocmd event.
Solution: Check the window pointer is still valid. (closesvim/vim#10156)
Remove the argument from may_trigger_winscrolled().
d58862d18f
