Merge pull request #80104 from bruvzg/freedesktop_native_file_dialog

[Linux/Freedesktop] Implement native file selection dialog support.

doc/classes/DisplayServer.xml

@@ -121,7 +121,9 @@
 				Displays OS native dialog for selecting files or directories in the file system.
 				Callbacks have the following arguments: [code]bool status, PackedStringArray selected_paths[/code].
 				[b]Note:[/b] This method is implemented if the display server has the [code]FEATURE_NATIVE_DIALOG[/code] feature.
-				[b]Note:[/b] This method is implemented on Windows and macOS.
+				[b]Note:[/b] This method is implemented on Linux, Windows and macOS.
+				[b]Note:[/b] [param current_directory] might be ignored.
+				[b]Note:[/b] On Linux, [param show_hidden] is ignored.
 				[b]Note:[/b] On macOS, native file dialogs have no title.
 				[b]Note:[/b] On macOS, sandboxed apps will save security-scoped bookmarks to retain access to the opened folders across multiple sessions. Use [method OS.get_granted_permissions] to get a list of saved bookmarks.
 			</description>

doc/classes/OS.xml

@@ -538,7 +538,7 @@
 			<return type="bool" />
 			<description>
 				Returns [code]true[/code] if application is running in the sandbox.
-				[b]Note:[/b] This method is implemented on macOS.
+				[b]Note:[/b] This method is implemented on macOS and Linux.
 			</description>
 		</method>
 		<method name="is_stdout_verbose" qualifiers="const">