private void goUpOneDirectoryLevel() {
		cancelEdits();

		if (currentDirectory() == null) {
			return;
		}
		File parentFile = currentDirectory().getParentFile();
		if (parentFile == null) {
			return;
		}
		updateDirOnly(parentFile, false);
	}
Sets the current directory. Passing in <code>null</code> sets the
file chooser to point to the user's default directory.
This default depends on the operating system. It is
typically the "My Documents" folder on Windows, and the user's
home directory on Unix.
<br>
If the file passed in as <code>currentDirectory</code> is not a
directory, the parent of the file will be used as the currentDirectory.
If the parent is not traversable, then it will walk up the parent tree
until it finds a traversable directory, or hits the root of the
file system.
@param directory the current directory to point to
@see #getCurrentDirectory
Ghidra/Framework/Docking/src/main/java/docking/widgets/filechooser/GhidraFileChooser.java