vim:aucmd: Delay cword highlighting by 100ms

This should lead to better performance while scrolling through a file.

.config/vim/vimrc.d/80-autocommands.vim

@@ -65,6 +65,21 @@ function! HighlightCurrentWord()
 		return
 	endif
 
+	" Delay the highlight by 100ms so that not every word is highlighted
+	" while moving the cursor fast. (This kind of simulates a CursorHold
+	" event with a custom time)
+	if exists('w:cword_timer_id')
+		" Abort the already running timer and its callback
+		call timer_stop(w:cword_timer_id)
+		call ClearHighlights(s:CLEAR_HIGHS_CWORD)
+	endif
+	let w:cword_timer_id = timer_start(100, "_HighlightCurrentWord")
+endfunction
+
+function! _HighlightCurrentWord(timer_id)
+	" TODO: there is probably some kind of race condition here
+	unlet w:cword_timer_id
+
 	let l:cword = expand('<cword>')
 	if exists('w:old_cword') && w:old_cword == l:cword
 		" Do not delete and readd the match if on the same word