void endSelectionSequence() {
			if (!selectionOn) {
				return;
			}
			scrollPoint = null;
			anchorPoint = null;
			if (selectionChanged) {
				notifySelectionChanged(EventTrigger.GUI_ACTION);
				selectionChanged = false;
			}
		}
Checks if the "control" modifier is on and the "shift" modifier is not.
Ghidra/Framework/Docking/src/main/java/docking/widgets/fieldpanel/FieldPanel.java