add per-pane display ownership

internal/app/session.go

@@ -742,6 +742,22 @@ func (s *Session) ResizeAll(cols, rows uint16) {
 	}
 }
 
+func (s *Session) ResizeChild(id string, cols, rows uint16) {
+	if cols == 0 || rows == 0 {
+		return
+	}
+	c := s.FindChild(id)
+	if c == nil {
+		return
+	}
+	if pty := c.PTY(); pty != nil {
+		_ = pty.Resize(cols, rows)
+	}
+	if em := c.Emulator(); em != nil {
+		_ = em.Resize(cols, rows)
+	}
+}
+
 // SerializeChild returns the VT bytes that reproduce the child's
 // current screen state. Used to repaint a child after the user switches
 // focus or closes the palette.