filesystemmodel: Ignore changes on the parent directory

Merged Corey Berla requested to merge wip/corey/filesystemmodel into main

The filesystemmodel tracks changes and additions to child files through G_FILE_MONITOR_EVENT_ATTRIBUTE_CHANGED. This event will also occur if the parent directory is changed. Since the parent directory doesn't exist in the model, it creates a non-existent item.

Fixes: #4233 (closed)

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