optimizations

sandbox/will/calculator.css

@@ -1,3 +1,7 @@
+Screen {
+    overflow: auto;
+}
+
 #calculator {
     layout: table;
     table-size: 4;
@@ -6,6 +10,7 @@
     table-rows: 1fr;
     margin: 1 2;
     min-height:23;  
+    min-width: 40; 
 }
 
 Button {

src/textual/geometry.py

@@ -551,6 +551,19 @@ class Region(NamedTuple):
             height + expand_height * 2,
         )
 
+    def clip_size(self, size: tuple[int, int]) -> Region:
+        """Clip the size to fit within minimum values.
+
+        Args:
+            size (tuple[int, int]): Maximum width and height.
+
+        Returns:
+            Region: No region, not bigger than size.
+        """
+        x, y, width, height = self
+        max_width, max_height = size
+        return Region(x, y, min(width, max_width), min(height, max_height))
+
     @lru_cache(maxsize=1024)
     def overlaps(self, other: Region) -> bool:
         """Check if another region overlaps this region.

src/textual/layouts/table.py

@@ -139,16 +139,18 @@ class TableLayout(Layout):
             y = rows[row][0]
             x2, cell_width = columns[min(max_column, column + column_span)]
             y2, cell_height = rows[min(max_row, row + row_span)]
+            cell_size = Size(cell_width + x2 - x, cell_height + y2 - y)
             width, height, margin = widget._get_box_model(
-                Size(
-                    x2 - x + cell_width,
-                    y2 - y + cell_height,
-                ),
+                cell_size,
                 viewport,
                 fraction_unit,
             )
-            region = Region(x, y, int(width), int(height)).shrink(margin)
+            region = (
+                Region(x, y, int(width), int(height))
+                .shrink(margin)
+                .clip_size(cell_size)
+            )
             add_placement(WidgetPlacement(region, widget))
             add_widget(widget)
 
-        return placements, {*widgets}
+        return (placements, set(widgets))