cocoa-cb: force redraw when screen or size changes

in certain circumstances the video was not redrawn even when the size
or the backing scale factor changed. this could lead to a lower
resolution output than intended.

now it redraws the video when screen properties or the window size
changes.

video/out/cocoa-cb/window.swift

@@ -301,6 +301,7 @@ class Window: NSWindow, NSWindowDelegate {
             let cRect = frameRect(forContentRect: rect)
             unfsContentFrame = rect
             setFrame(cRect, display: true)
+            cocoaCB.layer?.update(force: true)
         }
     }
 
@@ -464,6 +465,7 @@ class Window: NSWindow, NSWindowDelegate {
         }
         if currentScreen != screen {
             cocoaCB.updateDisplaylink()
+            cocoaCB.layer?.update(force: true)
         }
         currentScreen = screen
     }