removed old dock

src/textual/app.py

@@ -56,7 +56,6 @@ from .driver import Driver
 from .features import parse_features, FeatureFlag
 from .file_monitor import FileMonitor
 from .geometry import Offset, Region, Size
-from .layouts.dock import Dock
 from .message_pump import MessagePump
 from .reactive import Reactive
 from .renderables.blank import Blank

src/textual/layouts/factory.py

@@ -1,11 +1,9 @@
 from .horizontal import HorizontalLayout
 from .._layout import Layout
-from ..layouts.dock import DockLayout
 from ..layouts.vertical import VerticalLayout
 
 
 LAYOUT_MAP = {
-    "dock": DockLayout,
     "vertical": VerticalLayout,
     "horizontal": HorizontalLayout,
 }

src/textual/screen.py

@@ -118,6 +118,7 @@ class Screen(Widget):
             self._layout_required = False
             self._dirty_widgets.clear()
         if self._repaint_required:
+            self._dirty_widgets.clear()
             self._dirty_widgets.add(self)
             self._repaint_required = False