The save dialog should not allow to save under the .godot and .import folders

[Zylann]

Godot 3.2.1

If you try to save a scene, a resource or a script, Godot opens a save dialog which allows you to save it under .import/. However this is a bad idea, and should not be proposed IMO, at least by default.
Saving under .import causes a number of issues, such as:

• Assets in that folder cannot be accessed from the File Explorer. If your main scene is in there, it will still load when the project opens, but if you close it you can't reopen it again.
• Searching in files from the script editor does not include this folder, because again, it's not supposed to contain assets.
• Quick-open also doesn't list these assets (Ctrl+Shift+O and Ctrl+Alt+O) for the same reason
• Accidental loss of assets if you want to force reimport by deleting the folder, or version your files with a VCS while ignoring that folder (and bloat in the opposite case)
• Maybe more