[Good first issue] Instances List selection style bug

Hi, today working with Gdevelop, have noticed a small bug in the instances list items selection that affect all themes.

The selected item outline show only a top yellow line instead of the complete perimeter and the item selected haven’t his selection color that appear only if I resize the instances list frame box.

This happen on Gdevelop 5 Beta 95 on Windows 8.0 Pro 64 Bit

@4ian @Bouh below have done a small animated gif of the issue

Sorry for my bad english :blush:

UI_InstanceList_BUG

Confirmed on my side (Win10).