Actually, bug 1287126 isn't fully to blame here, it was just trying to correct a an issue introduced here: https://hg.mozilla.org/comm-central/rev/99eb42a1fd3d That changeset is described in bug 1287126 comment #6. So that "stuffed space removal code" was only restored, after bug 1230968 removed it. Take a look at attachment 8688319 [details] [diff] [review] from bug 26734 where the whole story began. Now we really need an expert to fix the mess caused in four bugs :-(
Bug 1689804 Comment 82 Edit History
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Actually, bug 1287126 isn't fully to blame here, it was just trying to correct a an issue introduced here: https://hg.mozilla.org/comm-central/rev/99eb42a1fd3d That changeset is described in bug 1287126 comment #6. So that "stuffed space removal code" was only restored, after bug 1230968 removed it. Take a look at attachment 8688319 [details] [diff] [review] from bug 26734 where the whole story began. Now we really need an expert to fix the mess caused in four bugs :-( EDIT: Since bug 1230968/bug 26734 was about DelSp processing for ISO-2022-JP which is no longer used for composition (all UTF-8 now), perhaps we can revert those hunks now.