Fix underline gaps in space characters
It turns out that trailing spaces _are_ significant, e.g. when the current rendition is set to underline. Gaps where appearing in underlined text with spaces. To test, launch konsole with -p BidiRenderingEnabled=false, and run: printf '\e[4mtest under line foo ññññ ááá ééé ' which should show no gaps in underlining, and exercises both instances of the "group non-wide characters with following spaces" code.
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