Is this actually a problem if SciTE changes the scroll width as soon as it sees a too long line? SciTE keeps the maximum scrollwidth it has seen anyways so the horizontal scrollbar could begin with being non-scrollable like the vertical scrollbar.
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SciTE starts with a scroll width that should be enough for most files. This avoids changing the scroll width during use.
Is this actually a problem if SciTE changes the scroll width as soon as it sees a too long line? SciTE keeps the maximum scrollwidth it has seen anyways so the horizontal scrollbar could begin with being non-scrollable like the vertical scrollbar.
For most documents, the scrollable width never has to change so this gives a more stable view.