Fix panels horizontal scroll glitch + fix some coverity defects #10351
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This should close #10339
Also fixes some coverity issues in canvas.c:
if the realloc() inside
expand_line
fails, instead of freeing the entire canvas, just abort the write, or else all future writes will fail (and from what I understand there were many defects just for this problem)Before considering merging, I would like to wait to check if #10339 is really fixed (I was only able to reproduce it in a virtual machine)