Large clipboard contents, like images, can exceed the maximum X request size
if sent all at once, which can cause the X server to kill the connection.

Instead of from WINED3DFMT_B8G8R8A8_UNORM.

For regular clears this is the intersection of the viewport and scissor
rectangles, but color fills shouldn't be affected by those.

server: Change the removable fd flag to a cacheable flag to make it possible for fd users to set it dynamically.

Spotted by Sylvain Hitier.