diff --git a/.github/workflows/comment.yml b/.github/workflows/comment.yml
new file mode 100644
index 000000000..f465b791d
--- /dev/null
+++ b/.github/workflows/comment.yml
@@ -0,0 +1,22 @@
+name: issues
+on:
+  issues:
+    types: [closed]
+jobs:
+  add-comment:
+    runs-on: ubuntu-latest
+    permissions:
+      issues: write
+    steps:
+      - name: Did I solve your problem?
+        uses: peter-evans/create-or-update-comment@a35cf36e5301d70b76f316e867e7788a55a31dae
+        with:
+          issue-number: ${{ github.event.issue.number }}
+          body: |
+            Did I solve your problem?
+
+            Consider [sponsoring my work](https://github.com/sponsors/willmcgugan) on Textual with a monthly donation.
+
+            Or buy me a [coffee](https://ko-fi.com/willmcgugan) to say thanks.
+
+            – [Will McGugan](https://twitter.com/willmcgugan)
diff --git a/examples/big_table.py b/examples/big_table.py
new file mode 100644
index 000000000..62ed95380
--- /dev/null
+++ b/examples/big_table.py
@@ -0,0 +1,36 @@
+from rich.table import Table
+from rich.measure import Measurement
+
+from textual import events
+from textual.app import App
+from textual.widgets import Header, Footer, ScrollView
+
+
+class MyApp(App):
+    """An example of a very simple Textual App"""
+
+    async def on_load(self, event: events.Load) -> None:
+        await self.bind("q", "quit", "Quit")
+
+    async def on_mount(self, event: events.Mount) -> None:
+
+        self.body = body = ScrollView()
+        #body.virtual_size.width = 300
+
+        await self.view.dock(body)
+
+        async def add_content():
+            table = Table(title="Demo", width=1000)
+
+            for i in range(40):
+                table.add_column(f'Col {i + 1}', style='magenta')
+
+            for i in range(200):
+                table.add_row(*[f'cell {i},{j}' for j in range(40)])
+
+            await body.update(table)
+
+        await self.call_later(add_content)
+
+
+MyApp.run(title="Simple App", log="textual.log")
diff --git a/src/textual/geometry.py b/src/textual/geometry.py
index a10f52635..98d25af70 100644
--- a/src/textual/geometry.py
+++ b/src/textual/geometry.py
@@ -74,7 +74,7 @@ class Size(NamedTuple):
     height: int
 
     def __bool__(self) -> bool:
-        """A Size is Falsey if it has area 0"""
+        """A Size is Falsey if it has area 0."""
         return self.width * self.height != 0
 
     @property
diff --git a/src/textual/layouts/vertical.py b/src/textual/layouts/vertical.py
index 63eccc3ae..692dab3ca 100644
--- a/src/textual/layouts/vertical.py
+++ b/src/textual/layouts/vertical.py
@@ -36,8 +36,6 @@ class VerticalLayout(Layout):
         gutter_height, gutter_width = self.gutter
         render_width = width - gutter_width * 2
 
-        render_width = 1000 + gutter_width * 2
-
         x = gutter_width
         y = gutter_height
         map: LayoutMap = LayoutMap(size)
diff --git a/src/textual/view.py b/src/textual/view.py
index f981fc9a9..d10e4f3cf 100644
--- a/src/textual/view.py
+++ b/src/textual/view.py
@@ -9,9 +9,9 @@ from rich.style import Style
 
 from . import events
 from . import log
+from . import messages
 from .layout import Layout, NoWidget
 from .geometry import Size, Offset, Region
-from .messages import Update, Layout
 from .reactive import Reactive, watch
 
 from .widget import Widget, Widget
@@ -86,10 +86,7 @@ class View(Widget):
     def get_offset(self, widget: Widget) -> Offset:
         return self.layout.get_offset(widget)
 
-    # def check_layout(self) -> bool:
-    #     return super().check_layout() or self.layout.check_update()
-
-    async def handle_update(self, message: Update) -> None:
+    async def handle_update(self, message: messages.Update) -> None:
         if self.is_root_view:
             message.stop()
             widget = message.widget
@@ -99,7 +96,7 @@ class View(Widget):
             if display_update is not None:
                 self.app.display(display_update)
 
-    async def handle_layout(self, message: Layout) -> None:
+    async def handle_layout(self, message: messages.Layout) -> None:
         if self.is_root_view:
             message.stop()
             await self.refresh_layout()
@@ -245,4 +242,4 @@ class View(Widget):
     async def action_toggle(self, name: str) -> None:
         widget = self.named_widgets[name]
         widget.visible = not widget.visible
-        await self.post_message(Layout(self))
+        await self.post_message(messages.Layout(self))
diff --git a/tests/test_geometry.py b/tests/test_geometry.py
index 40fd1e564..ffaded07b 100644
--- a/tests/test_geometry.py
+++ b/tests/test_geometry.py
@@ -60,6 +60,7 @@ def test_clamp():
     assert clamp(11, 0, 10) == 10
     assert clamp(0, 0, 10) == 0
     assert clamp(10, 0, 10) == 10
+    assert clamp(5, 10, 0) == 5
 
 
 def test_point_is_origin():
@@ -185,3 +186,35 @@ def test_region_intersection():
 
 def test_region_union():
     assert Region(5, 5, 10, 10).union(Region(20, 30, 10, 5)) == Region(5, 5, 25, 30)
+
+
+def test_size_add():
+    assert Size(5, 10) + Size(2, 3) == Size(7, 13)
+
+
+def test_size_sub():
+    assert Size(5, 10) - Size(2, 3) == Size(3, 7)
+
+
+def test_region_x_extents():
+    assert Region(5, 10, 20, 30).x_extents == (5, 25)
+
+
+def test_region_y_extents():
+    assert Region(5, 10, 20, 30).y_extents == (10, 40)
+
+
+def test_region_x_max():
+    assert Region(5, 10, 20, 30).x_max == 25
+
+
+def test_region_y_max():
+    assert Region(5, 10, 20, 30).y_max == 40
+
+
+def test_region_x_range():
+    assert Region(5, 10, 20, 30).x_range == range(5, 25)
+
+
+def test_region_y_range():
+    assert Region(5, 10, 20, 30).y_range == range(10, 40)