Add an aside preview and thumbnails to the Qt file dialog
This tries to make the default Qt file dialog a bit more usable.
Todo:
- cache the icons, because right now it's really slow: it looks like QFileSystemModel creates an icon for all files in the current folder, not justs asks for an icon when a file becomes visible.
- create a new delegate, so the icons are bigger.
- maybe make the file icons optional...
See BUG:430456 (https://bugs.kde.org/show_bug.cgi?id=430456)
Edited by Halla Rempt