Make the editor image selection popup list scrollable with a CScrollRegion to support maps with many images. The width of the popup and list are also increased to support maps with longer names. Editor world/map scrolling with the mouse wheel is disabled while a popup is active, to better support popups with scrollable content. Before: !images-list old After: ![images-l...

Loading the already selected map with double click or enter directly after filtering the maps list did not work, as the filename buffer (and its respective lineinput, which not shown in the Load file dialog) was not updated at that point.