@Override
			public void mouseExited(MouseEvent e) {
				if (!isHelpEnabled()) {
					return;
				}

				restoreCursor();
				hoveredColumnIndex = -1;
				repaint();
			}
This is the cursor used by BasicTableHeaderUI to tell the user they can resize a column
Ghidra/Framework/Docking/src/main/java/docking/widgets/table/GTableHeader.java