private void swapPrograms() {
		DomainFile newSourceFile = destinationFile;
		DomainFile newDestionationFile = sourceFile;
		setSourceFile(newSourceFile);
		setDestinationFile(newDestionationFile);
		statusChangedCallback.call();
	}
Presents the user with a tree of the existing project folders and allows
them to pick one
Ghidra/Features/VersionTracking/src/main/java/ghidra/feature/vt/gui/wizard/session/SessionConfigurationPanel.java