FXFileChooser
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Replace progress bar in director ychooser with an animation + add control to abort folder scanning.
The directory chooser indicates folder scanning by using a shrinked progress bar. An animation (e.g. jumping / pumping directory icon or an icon with a loupe, rotating etc.) would be a better match.
Also as of now one can abort folder scanning but this is only indicated by a tool tip. It would be better to create a red cross etc. or another more clear indication.