app,app/internal/wm: [macOS] refresh context on display change

The NSViewGlobalFrameDidChangeNotification notification is documented to
be fired every time [NSOpenGLContext update] needs to be called.
However, the notification fails to fire on my setup when a window is
moved to a display with a different pixel scale, which leads to
incorrectly sized output.

This change gets rid of the notification and updates the context before
every frame.

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

app/loop.go

@@ -17,6 +17,7 @@ type renderLoop struct {
 	drawing bool
 	err     error
 
+	ctx        wm.Context
 	frames     chan frame
 	results    chan frameResult
 	refresh    chan struct{}
@@ -38,6 +39,7 @@ type frameResult struct {
 
 func newLoop(ctx wm.Context) (*renderLoop, error) {
 	l := &renderLoop{
+		ctx:        ctx,
 		frames:     make(chan frame),
 		results:    make(chan frameResult),
 		refresh:    make(chan struct{}),
@@ -132,6 +134,7 @@ func (l *renderLoop) Summary() string {
 }
 
 func (l *renderLoop) Refresh() {
+	l.ctx.Refresh()
 	if l.err != nil {
 		return
 	}