[0.93.1] Video that deadlocks browser

[foxyshadis]

I have a video that consistently deadlocks the background thread that creates thumbnails; while things in the same folder can still be opened, any attempt to change the folder or close XnView will completely hang the whole program. (This was me earlier this evening.) 0.93.1 x64 on Windows 10 1903.

[xnview]

known issue, will be fixed in 0.94