Adam Jakubek f7e6593910 LibGUI: Fix assertion when handling removal of FileSystemModel's root ...

This commit fixes FileSystemModel behaviour when the root path of the
model has been deleted.
In this case, the model index resolved for the root path is invalid and
passing it to 'begin_delete_rows' would trigger assertion failure.

Instead of deleting all children rows one by one, we simply invalidate
the whole model.

2022-08-31 10:32:41 +01:00

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