CTabFolder: combine mouse enter and mouse move cases

This seem to be logical continuation of the previous commit where
we wanted to NOT set the tooltip to the null but to a proper value
already on mouse enter.

With the "mouse enter" was issued last, after "mouse exit", at same
location and without any events following, it would also make sense to
draw the same state as it would be on the last move.

See #2017

Author: iloveeclipse

bundles/org.eclipse.swt/Eclipse SWT Custom Widgets/common/org/eclipse/swt/custom/CTabFolder.java

@@ -1813,10 +1813,6 @@ void onMouse(Event event) {
 	}
 	int x = event.x, y = event.y;
 	switch (event.type) {
-		case SWT.MouseEnter: {
-			_setToolTipText(event.x, event.y);
-			break;
-		}
 		case SWT.MouseExit: {
 			for (int i=0; i<items.length; i++) {
 				CTabItem item = items[i];
@@ -1911,6 +1907,10 @@ public void run() {
 			}
 			break;
 		}
+		case SWT.MouseEnter: {
+			// fall through to the "move" case, see
+			// https://github.com/eclipse-platform/eclipse.platform.swt/issues/2017
+		}
 		case SWT.MouseMove: {
 			_setToolTipText(event.x, event.y);
 			boolean close = false;