Improve error handling for the search functions.

resources and provides extra sanity checks.

whole document.

with snd_pcm_drain which is more likely to do what the original author
intended.

false errors on some systems.

menu item state while adding MDI system menu buttons and generating
WM_SYSCOMMAND messages.

menu item state while handling WM_X11DRV_DELETE_WINDOW request.

- use a struct to handle wined3d settings
- prepare VBO using some abstraction APIs

returned (even if that is NULL) - previously, it could happen that
when no theme was active or the theme data could not be opened that
the window theme remained became then-dangling (and hence subsequent
calls to GetWindowTheme() would return that bogus theme).

alone, it also falls back to the border size or sizing margins, and if
it can't find any possible margins at all, it returns the original
rectangle.

keywords.