Arduino IDE freeze

[Jomelo]

Hello,
i can reproduce an error which i can freeze the arduino ide.
Tested on Windows 10 Pro 64bit, latest Update,

1. Press "File"
2. Press "Save as"
3. delete a displayed folder in the "save as" window. -> the ide is freezing.

Only the Task-Manager can help.

[per1234]

Closing as duplicate of
#5191
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