fix(terminal): properly trim lines with widechars on resize #1545
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This is a fix for #1206
This also happens when we simply resize the pane without even opening vim or a similar app. The latter happens because we call the resize/reflow method when moving away from an alternative screen (in case the scrollback was resized somewhere in between).
In such a case, we trim lines after the last whitespace to that we won't reflow needless whitespace (eg. have a wrapped line with only whitespace). This mechanism wasn't wide-char aware, and because of that this bug was created. I adjusted it and it now works.