optimize screen size

Author: willmcgugan

src/textual/screen.py

@@ -341,6 +341,11 @@ def layers(self) -> tuple[str, ...]:
             extras.append("_tooltips")
         return (*super().layers, *extras)
 
+    @property
+    def size(self) -> Size:
+        """The size of the screen."""
+        return self.app.size - self.styles.gutter.totals
+
     def _watch_focused(self):
         self.refresh_bindings()
 
@@ -512,7 +517,7 @@ def get_maximize_widgets(maximized: Widget) -> list[Widget]:
                 else self._nodes
             ),
             size,
-            self.app.size,
+            self.size,
             False,
         )
 

src/textual/widget.py

@@ -605,7 +605,7 @@ def offset(self) -> Offset:
         Returns:
             Relative offset.
         """
-        return self.styles.offset.resolve(self.size, self.app.size)
+        return self.styles.offset.resolve(self.size, self.screen.size)
 
     @offset.setter
     def offset(self, offset: tuple[int, int]) -> None:
@@ -1263,7 +1263,7 @@ def _arrange(self, size: Size, optimal: bool = False) -> DockArrangeResult:
             return cached_result
 
         arrangement = self._arrangement_cache[cache_key] = arrange(
-            self, self._nodes, size, self.app.size, optimal=optimal
+            self, self._nodes, size, self.screen.size, optimal=optimal
         )
 
         return arrangement