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When no folder is opened, the wrong function was used. This resulted in the pop-up not appearing.
The fix proposed in this PR first tells users that they have to pick a folder, and adds a button to allow students to choose a folder.
For ease-of-mind, selecting files & multiple folders are disabled. Just choose a folder.
Note: this doesn't show the documents anymore after opening the folder, as
window
andworkspace
don't really exist anymore (choosing a folder re-creates these). The file is still created. Students can just click on the exercise again afterwards.