synchronized public void setFilter(int type, boolean filter) {
		if (filter) {
			filterFlags |= type;
		}
		else {
			filterFlags &= (~type);
		}
	}
setFilter specifies whether or not the indicated type of difference will be
included by the filter (true) or not included (false).

@param type the set bits indicate the type of differences we want to 
look for in the programs.
<BR>For example, one or more of the diff types "OR"ed together.
<BR>i.e. CODE_UNIT_DIFFS | SYMBOL_DIFFS
@param filter true if you want to determine differences of the specified type.
Ghidra/Features/Base/src/main/java/ghidra/program/util/ProgramDiffFilter.java