For node region, `event_cursor` is true, it sends update to the cursor
every draw call, this restores the cursor `WM_CURSOR_X_MOVE`.
Issue is originally caused by e6d941cdf4 and it introduced couple other
issues. So best fix would be to revert the commit. And to fix#129178,
restore modal cursor after drawing context menu, i.e. execution of
`ui_popup_context_menu_for_button`.
Pull Request: https://projects.blender.org/blender/blender/pulls/132848
60ac0421b3