Image cache won't be released while using the same window mode

[nyaatrap]

This issue is appeared on Windows7 64bit OS. Ren'py keeps image cache until it gets an out of memory error. Changing the window mode or minimizing the window is the only way to release image cache. More detail: http://lemmasoft.renai.us/forums/viewtopic.php?f=32&t=18633

[nyaatrap]

Additional note. Enabling hardcore acceleration on Intel HD graphic consumes double-sized memory (It may be natural since it's a chipset without VRAM). In this condition, dragging a window to change its size releases this extra memory usage. Still, it needs minimizing a window to release all caches.

[renpytom]

The first one is fixed in 8fd52a3. The second one looks like it's specific to the intel driver, and not something I can fix.

Thanks for putting together a really good test case - it made things very easy to find. Happy new year.