scene/cursordelegate_opengl: undo ortho() flip y
Flip y axis before and after applying renderTarget.transform to undo ortho() flipping the y axis. Otherwise the cursor is invisible on rotated screen.
BUG: 479764 FIXED-IN: 6.0
A small math puzzle: what can be wrong if the algorithm works for Rotate0, Rotate180, FlipX, FlipY, but not Rotate90, Rotate270, Flip90, and Flip270
Edited by Yifan Zhu