[suggestion] reduce thickness of thumbnail edges at 1 pixel on 5/6/7/8 zoom levels.
right now the edge of thumbnails (black/white borders) are 2 pixels this from 21/21 to 5/21 zoom levels but on 8 7 6 5 zoom levels the border is making small thumbnail black/white or almost black/white (borders size is comparable to some clips lenght)
if it's possible can be better to have 1 pixel only thickness on 4/5/6/7/8 .. and 2 pixels on 9 and more... and no thickness at all on 1/2/3 (this can increase speed of timeline drawing by 50% or more)
1/2/3 zoom - no thickness
4/5/6/7/8 - 1 pixel
9/10/11/12/13/14/15/16/17/18/19/20/21 - 2 pixels
Edited by Davy Bartoloni