Have a way to play videos in their native resolution
There seems to be no easy way to play a small-resolution video in its native resolution. In particular, screen recordings scale very poorly, so currently the only way to play a screencast on a larger-resolution screen than it was recorded from (or simply a recording of a screen area) is resize the window until video playback widget height perfectly matches the video, probably with GtkInspector open to see the allocation.
Real-life use case: I cannot play screen recordings from my previous laptop with a 1366x768 screen on the current one with 1920x1080 screen without them being blurred.
Edited by Alice Mikhaylenko