Canvas no longer updated when timelapse stops playing after last frame

[qosch]

Steps to reproduce:

• open a timelapse in the darkroom
• start playing it by clicking on "play" in the "animation" module in the "esoteric" tab
• wait for it to stop playing after reaching the last frame
• move the slider of a development module like "exposure"

Expected behavior:

• the last frame is continued to be displayed and updated as the slider is moved

Observed behavior:

• the last frame is continued to be displayed but not updated as the slider is moved

[hanatos]

my guess is that it's because the animation does not actually stop if you reach the last frame. i think it pretends to go on but clamps the frame to the last one. will have a look.