https://bugs.kde.org/show_bug.cgi?id=498870

--- Comment #7 from Ron <kdenlive-b...@contact.dot-oz.net> ---
The inability to have two subtitles with the same start time isn't something
fundamental to
subtitle files or their renderers.  You can craft such a file outside of
kdenlive and it will work
just fine in most if not all players.  In theory kdenlive can even render it
correctly.

Disallowing that, and using 'layers' as a workaround for it, is an artificial
limitation that was
created to 'solve' the problem of how to handle perfectly overlapping clips in
the timeline
UI, and the problem of them being internally indexed by start time which didn't
permit
having them together in the kdenlive internal structures for manipulating
clips.

Using (ASS) layers isn't a good workaround for that, because most/all renderers
will display two
subtitles on different layers differently to how it displays overlapping
subtitles that are on the
same layer.  If they are on different layers, then they will overwrite each
other (without explicit
re-positioning) rather than being cleanly shown together.  (It does make some
sense to show
them that way on the UI timeline when subtitles overlap, in a similar way to
showing any other
overlapping clips on different tracks, just not to link that function to 'ass
layers' which do
something different, and almost completely opposite).

All these problems have been addressed in my current dev branch, and importing
or otherwise
adding overlapping subtitles works correctly in the editor the same as it does
in the renderer.

So this bug is in the set that will be closed when that work is completed and
lands in a release.

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