RANes - Screen stops updating after the window has lost focus for a long time.

[jared6502]

When leaving the emulator open with a game loaded and running for a long period of time (overnight, for example) with another window having focus, the emulator stops redrawing the game on the window. The game is still running, controls and sound still work, but for some reason nothing ever gets redrawn on the window and the emulator has to be restarted.