fix for grid auto (#3113)

* fix for grid auto

* 3.7 fix

Author: willmcgugan

CHANGELOG.md

@@ -11,6 +11,10 @@ and this project adheres to [Semantic Versioning](http://semver.org/).
 
 - grid-columns and grid-rows now accept an `auto` token to detect the optimal size https://github.com/Textualize/textual/pull/3107
 
+### Fixed
+
+- Fixed auto height container with default grid-rows https://github.com/Textualize/textual/issues/1597
+
 ## [0.33.0] - 2023-08-15
 
 ### Fixed

src/textual/layouts/grid.py

@@ -21,7 +21,9 @@ def arrange(
         self, parent: Widget, children: list[Widget], size: Size
     ) -> ArrangeResult:
         styles = parent.styles
-        row_scalars = styles.grid_rows or [Scalar.parse("1fr")]
+        row_scalars = styles.grid_rows or (
+            [Scalar.parse("1fr")] if size.height else [Scalar.parse("auto")]
+        )
         column_scalars = styles.grid_columns or [Scalar.parse("1fr")]
         gutter_horizontal = styles.grid_gutter_horizontal
         gutter_vertical = styles.grid_gutter_vertical