add per-pane display ownership

internal/app/client_subscriber.go

@@ -15,6 +15,8 @@ const defaultClientSubscriberQueue = 256
 // needing a fresh snapshot.
 type clientSubscriber struct {
 	projectKey string
+	project    *Project
+	clientID   string
 	frames     chan protocol.Frame
 
 	mu               sync.Mutex
@@ -22,12 +24,18 @@ type clientSubscriber struct {
 	lifecycleDirty   bool
 }
 
-func newClientSubscriber(projectKey string, size int) *clientSubscriber {
+func newClientSubscriber(project *Project, clientID string, size int) *clientSubscriber {
 	if size <= 0 {
 		size = defaultClientSubscriberQueue
 	}
+	projectKey := ""
+	if project != nil {
+		projectKey = project.Key
+	}
 	return &clientSubscriber{
 		projectKey:       projectKey,
+		project:          project,
+		clientID:         clientID,
 		frames:           make(chan protocol.Frame, size),
 		snapshotRequired: make(map[string]bool),
 		lifecycleDirty:   false,
@@ -72,7 +80,12 @@ func (s *clientSubscriber) OnChildStateChanged(id string, state IdleState) {
 
 func (s *clientSubscriber) OnPTYOut(childID string, chunk []byte) {
 	cp := append([]byte(nil), chunk...)
-	f, err := protocol.NewFrame(protocol.FramePaneChunk, protocol.PaneChunk{PaneID: childID, Bytes: cp})
+	var size protocol.Size
+	var ownerID string
+	if s.project != nil {
+		size, ownerID, _ = s.project.PaneDisplay(childID)
+	}
+	f, err := protocol.NewFrame(protocol.FramePaneChunk, protocol.PaneChunk{PaneID: childID, Bytes: cp, Size: size, DisplayOwner: ownerID == "" || ownerID == s.clientID})
 	if err != nil {
 		return
 	}