[TxMt] Folders in file browser randomly expanding

[Gerd Knops]

There is definitely a bug there somewhere. Just now I had a situation where any keyboard shortcut involving "Alt" would expand a set of folders (not all) in the file browser.

After changing selections a few times in the file browser it stopped as mysteriously as it started.

On at least on two occasions before "Alt" clicking a tab's close button had the same effect.

Gerd