private void displayError(Composite destComposite, Exception e) {
		String msg = "Some of your changes to " + destComposite.getName() +
			" cannot be merged.\nProblem: " + e.getMessage();
		String typeName = (destComposite instanceof Union) ? "Union" : "Structure";
		MergeManager.showBlockingError(typeName + " Update Failed", msg);
	}
Bitfield insertions can cause excess growth of structure which must be trimmed.
@param struct structure to be trimmed
@param preferredSize preferred structure size
Ghidra/Features/Base/src/main/java/ghidra/app/merge/datatypes/DataTypeMergeManager.java