App folder icon does not scale properly; shifts caption text down
When the app folder icon has to be scaled, the resulting icon can be larger than the intended size. This in turn shifts the caption down by a few pixels compared to non-folder icons. This affects master as well as 3.36, but it is worse in 3.36 due to the difference in when/how icons are scaled.
Problem seen on master with 1280x720. I added a red line to help see the difference in the caption position:
This is caused by FolderView::createFolderIcon() using a size of 0.4 of the target icon size for its sub-icons, but does not consider the padding+spacing specified in the CSS, which could exceed the remaining 0.2 * size for small sizes.