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Problem: ml_get error when scrolling after delete
Solution: mark topline to be validated in main_loop
if it is larger than current buffers line
count
reset_lnums() is called after e.g. TextChanged autocommands and it may
accidentally cause curwin->w_topline to become invalid, e.g. if the
autocommand has deleted some lines.
So verify that curwin->w_topline points to a valid line and if not, mark
the window to have w_topline recalculated in main_loop() in
update_topline() after reset_lnums() returns.
fixes: vim/vim#13568
fixes: vim/vim#13578
https://github.com/vim/vim/commit/c4ffeddfe5bd1824650e9b911ed9245bf56c69e3
The error doesn't happen in Nvim because Nvim triggers TextChanged after
calling update_topline().
Co-authored-by: Christian Brabandt <cb@256bit.org>
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