[Bug 52236] Performance regression in Eden's Ritter - Chapter 2 (demo)

[WineHQ Bugzilla]

https://bugs.winehq.org/show_bug.cgi?id=52236

--- Comment #9 from Henri Verbeet  ---
Created attachment 71548
  --> https://bugs.winehq.org/attachment.cgi?id=71548
patch

It looks like that happens because destroy_gl_drawable() ends up destroying
"gl->window", but doesn't clear the "client_window" field in the
x11drv_win_data structure.

The attached patch gets around it, but I'm not at all confident it's reasonable
or correct. It's probably going to require either me reading up on how the
OpenGL parts of winex11 work these days, or a look from someone that already
understands that code.