public void setFileSelectionMode(GhidraFileChooserMode mode) {
		this.fileSelectionMode = Objects.requireNonNull(mode);
	}
Sets this file chooser to allow the user to just select files, just select
directories, or select both files and directories.  The default is
{@link GhidraFileChooserMode#FILES_ONLY}.

@param mode the type of files to be displayed
Ghidra/Framework/Docking/src/main/java/docking/widgets/filechooser/GhidraFileChooser.java