add per-pane display ownership

internal/app/client_net.go

@@ -134,6 +134,8 @@ type netClient struct {
 
 	mu        sync.Mutex
 	focusedID string
+	paneSize  protocol.Size
+	ownerView bool
 	chrome    chromeModel
 	renderer  *viewportRenderer
 	palette   *clientCommandPrompt
@@ -287,10 +289,13 @@ func (c *netClient) handleFrame(f protocol.Frame) error {
 		}
 		c.mu.Lock()
 		c.focusedID = msg.PaneID
-		c.renderer = newViewportRenderer(c.layout)
+		c.paneSize = msg.Size
+		c.ownerView = msg.DisplayOwner
+		c.renderer = newViewportRenderer(c.renderLayoutLocked(msg.Size))
 		renderer := c.renderer
 		c.mu.Unlock()
 		c.clearViewport()
+		c.drawChrome()
 		c.writeWrapped(renderer.Render(msg.Bytes))
 	case protocol.FramePaneChunk:
 		msg, err := protocol.Decode[protocol.PaneChunk](f)
@@ -300,6 +305,11 @@ func (c *netClient) handleFrame(f protocol.Frame) error {
 		c.mu.Lock()
 		focused := c.focusedID
 		renderer := c.renderer
+		c.paneSize = msg.Size
+		c.ownerView = msg.DisplayOwner
+		if renderer != nil && (msg.Size.Cols != 0 || msg.Size.Rows != 0) {
+			renderer.SetLayout(c.renderLayoutLocked(msg.Size))
+		}
 		c.mu.Unlock()
 		if msg.PaneID == focused && renderer != nil {
 			c.writeWrapped(renderer.Render(msg.Bytes))
@@ -508,7 +518,7 @@ func (c *netClient) resize(cols, rows uint16) error {
 	c.mu.Lock()
 	c.layout = newTerminalLayout(cols, rows)
 	if c.renderer != nil {
-		c.renderer.SetLayout(c.layout)
+		c.renderer.SetLayout(c.renderLayoutLocked(c.paneSize))
 	}
 	size := protocol.Size{Cols: c.layout.childCols(), Rows: c.layout.childRows()}
 	c.mu.Unlock()
@@ -519,6 +529,17 @@ func (c *netClient) resize(cols, rows uint16) error {
 	return c.t.Send(f)
 }
 
+func (c *netClient) renderLayoutLocked(size protocol.Size) terminalLayout {
+	l := c.layout
+	if size.Cols != 0 && size.Cols < l.mainCols {
+		l.mainCols = size.Cols
+	}
+	if size.Rows != 0 && size.Rows < l.mainRows {
+		l.mainRows = size.Rows
+	}
+	return l
+}
+
 func (c *netClient) enterScreen() {
 	_, _ = c.out.Write([]byte("\x1b[?1049h\x1b[H\x1b[2J\x1b[?25h\x1b[?1000h\x1b[?1006h"))
 	c.installScrollRegion()
@@ -589,6 +610,13 @@ func (c *netClient) drawChrome() {
 	if model.FocusedID != "" {
 		status = fmt.Sprintf("%s · %s", model.FocusedID, status)
 	}
+	c.mu.Lock()
+	size := c.paneSize
+	ownerView := c.ownerView
+	c.mu.Unlock()
+	if model.FocusedID != "" && !ownerView && size.Cols != 0 && size.Rows != 0 {
+		status = fmt.Sprintf("viewing at owner size %dx%d · %s", size.Cols, size.Rows, status)
+	}
 	if prompt != nil {
 		status = "command: " + string(prompt.buf)
 	}