app: avoid deadlock on context refresh

The platform GPU context must be Refreshed on the window event thread,
but our rendering loop must not, because it may also want access to the
window event thread.

Fixes gio#236

Signed-off-by: Elias Naur <mail@eliasnaur.com>

app/loop.go

@@ -134,7 +134,6 @@ func (l *renderLoop) Summary() string {
 }
 
 func (l *renderLoop) Refresh() {
-	l.ctx.Refresh()
 	if l.err != nil {
 		return
 	}

app/window.go

@@ -416,8 +416,9 @@ func (w *Window) destroy(err error) {
 
 func (w *Window) refresh() {
 	w.driverRun(func(_ wm.Driver) {
-		w.loop.Refresh()
+		w.ctx.Refresh()
 	})
+	w.loop.Refresh()
 }
 
 func (w *Window) destroyGPU() {