protected void programDeactivated(Program program) {
		// override
	}
Subclass should override this method if it is interested when programs become inactive.
Note: this method is called in response to a ProgramActivatedPluginEvent and there is
a currently active program.

At the time this method is called,
the "currentProgram" variable will be set the
new active program or null if there is no new active program.

@param program the old program going inactive.
Ghidra/Features/Base/src/main/java/ghidra/app/plugin/ProgramPlugin.java