Currently with Folder-View-on-the-desktop, items' labels become illegibe when the icon size is very small.

This patch implements a minimum width when using on-the-desktop icon view to make sure that the label is never uselessly short when using very small icons.

BUG: 379432
FIXED-IN: 5.12.8

Smallest size, before:

Smallest size, after:
Equal padding on either side of the container itself still works:

There is no change for sizes corresponding to the fourth tick on the slider and beyond