Memory leaks when switching tabs, resizing window, or doing generally any UI operations

It seems that the memory allocated to the sprite viewer (the animation/zoomable view) is not properly released when the selected sprite is changed.  
Easily seen in task manager if selecting multiple sprites to view them animated, memory usage constantly increases every 1-3 seconds.

Bug is present in latest version (5.0.0) but was present in previous version as well at least.
OS: Windows 10