public Function getSourceFunction() {
		Side activeSide = comparisonPanel.getActiveSide();
		return comparisonPanel.getFunction(activeSide.otherSide());
	}
Returns the function that is the source of the info being applied. This will be whichever
side of the function diff window that isn't active. 
@return the function to get information from
Ghidra/Features/Base/src/main/java/ghidra/features/base/codecompare/panel/CodeComparisonActionContext.java