Mobile: keyboard goes over FileDialog's content: can't see what you're typing

[andrea-calligaris]

Godot version

3.3.4 stable

System information

Android

Issue description

Writing on FileDialog's path while on mobile, the smartphone's keyboard goes over the FileDialog, therefore you can't see what you're typing.
Not sure how this could be fixed, though.
However there probably is no need to fix this since accessing the OS's default file manager will make FileDialog useless for mobile.

Steps to reproduce

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Minimal reproduction project

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