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+++ This bug was initially created as a clone of Bug #17273 +++ Currently if you set line:-2 and the line wraps, the -1 line gets filled with text. If you wanted to have the -1 line "free", that seems annoying, especially since you can't know if the line will wrap or not. Use case: authoring subtitles and wanting to avoid overlapping a particular part of the video, for instance a sign. Proposed solution: introduce a setting to make horizontal lines grow upwards instead of downwards.
If you don't want to overlap something, you wouldn't use the line-based subtitle mechanism, since that depends a lot on the font size, which could be entirely up to the user. The 'lines' mode is intended for when there are multiple lines of subtitles going in and out around each other, e.g. multiple people talking. It would be good to get a bunch of examples of those specific cases and see whether they grow up or down (or never spill to multiple lines, which I suspect might be the more common case...).