MediaLibrary Previewer window dimensions not calculated correctly
Minor/bite-sized issue, but filing it in case someone wants to toy with fixing it: the previewer that shows up when double-clicking a video in the media library is supposed to automatically size to show the video at 1:1 size (when possible) or scaled to fill almost all the screen to the extent that the window itself would not "waste" space, by measuring the size of the window components vs the video aspect ratio.
This currently is buggy, as you can see there's extra space on the left and right side; possibly the window calculations do not take into account the playback button+slider height:
But while we're at it, that window could also be ported to use a headerbar, and put the playback controls in the headerbar...
Edited by Alexandru Băluț