187
Obscure button tier list
(sh.itjust.works)
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ins switches between inserting and replacing text, very useful.
For when the text you want to replace is exactly as long as the text you want to replace it with? Wouldn't you have to toggle it mid typing otherwise? Seems more useful to just shift+ctrl+right arrow and then type.
I personally never find myself needed that, I just selected and overwrite instead.
I find inserting text to be extremely confusing.