> Oh, I didn't expect that a sign without text is even valid. There is 
> 
> also a signcolumn patchน it should be in the todo list somewhere.
It can be empty and it's useful for some cases (for linehl or for preventing 
SignColumn to collapse).

> Is there a way to reproduce the issue easily (preferably without any 
> 
> plugin)?
Well, it's not that easy. I can solidly reproduce bug on my setup (with using 
plugin YouCompleteMe). I'm catching screenclear by setting breakpoint on 
calling screenclear function in gdb and then modifying one char in one line to 
toggle SignColumn refreshing by YouCompleteMe.

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