Thumbnails bad arrangement while changing zoom with mouse
In Lighttable view the bottom slider set how many images per row are displayed.
Everything works fine if the value is changed while dragging the slider or using mouse wheel on hover.
But if the shortcut CTRL+MWheel is used to zoom out, the layout is messed up leaving spaces on top and bottom of the filmstrip.
Scrolling down with mouse wheel partially recover the situation, because the top empty space is removed, but some empty "cells" can survive at the beginning of the film strip.
The only solution is to fully zoom in (without CTRL pressed), scroll to the first image full size and then zoom out (without CTRL pressed).