perf(transitions): show background capture while in full-screen webcam transition mode

Author: jkuri

Reframed/Compositor/CameraVideoCompositor.swift

@@ -418,7 +418,9 @@ final class CameraVideoCompositor: NSObject, AVVideoCompositing, @unchecked Send
               drawRect = aspectFillRect(imageSize: virtualSize, in: fullRect)
             }
             context.saveGState()
-            drawBackground(in: context, rect: fullRect, instruction: instruction, colorSpace: colorSpace)
+            if regionTransition == nil || regionTransition!.type == .none {
+              drawBackground(in: context, rect: fullRect, instruction: instruction, colorSpace: colorSpace)
+            }
             context.clip(to: fullRect)
             if instruction.cameraMirrored {
               context.translateBy(x: drawRect.midX, y: 0)

Reframed/Editor/VideoPreviewView.swift

@@ -620,8 +620,9 @@ final class VideoPreviewContainer: NSView {
       }
 
       webcamWrapper.layer?.shadowOpacity = 0
-      screenContainerLayer.isHidden = true
-      cursorOverlay.isHidden = true
+      let fsTransitioning = hasActiveTransition
+      screenContainerLayer.isHidden = !fsTransitioning
+      cursorOverlay.isHidden = !fsTransitioning
       webcamWrapper.frame = canvasRect
       webcamView.frame = webcamWrapper.bounds
       webcamView.layer?.cornerRadius = 0