Window.driverFunc says it can be run from any context. However, running
it from the Window.run event loop may deadlock, at least until an
unrelated event arrives from the driver (e.g. a mouse move).
Example:
Window.Invalidate is called, which caused Window.run to queue a driver
func, and notify the Window.wakeups channel. However, another
Window.Invalidate arrives just in time for Window.run to process that
before Window.wakeups, leading to a deadlock because only one driver
func can be queued.
This change fixes the problem by processing wakeups before potentially
queueing more driver functions.
Signed-off-by: Elias Naur <mail@eliasnaur.com>
Elias Naur
c9d85c97e1