Use SEQ_time_strip_intersects_frame function to test if strip intersects with frame.
Note: There are cases where this function should not be used. For example splitting
strips require at least 1 frame "inside" strip. Another example is drawing, where
playhead technically doesn't intersect strip, but it is rendered, because current
frame has "duration" or "thickness" of 1 frame.
Reviewed By: sergey
Differential Revision: https://developer.blender.org/D11320
When cache is strip is invalidated, movie file was reloaded even if it
isn't necessary. This caused significant performance issues when strip
is being dragged under playhead.
This was caused by calling `SEQ_relations_sequence_free_anim()` and it
was introduced as fix for T36124.
When it is necessary to reload file because another API holds reference
to ImBuf, do this explicitly besides cache invalidation.
In `rna_ColorManagedColorspaceSettings_reload_update()` this was already
done, so no change is needed there.
Reviewed By: sergey
Differential Revision: https://developer.blender.org/D11024
Meta strip cache is not invalidated if strip inside of meta strip is
invalidated.
Find all metastrips that contain invalidated strip and invalidate them
recursively.
Reviewed By: sergey
Differential Revision: https://developer.blender.org/D10192
Move most functions into separate files.
File sequencer.c is reserved for alloc, free and duplicating functions.
There should be no functional changes.
