Fix legend_key_height

fixes #921

Author: has2k1

doc/changelog.qmd

@@ -11,6 +11,11 @@ title: Changelog
   [](:attr:`~plotnine.data.midwest`) no longer have any of their columns as categoricals.
   This matches the respective datasets in R. {{< issue 913 >}}
 
+### Bug Fixes
+
+- Fixed bug in with the `legend_key_height` themeable where it wasn't applied.
+  {{< issue 921 >}}
+
 ## v0.14.5
 (2025-01-02)
 [![](https://zenodo.org/badge/DOI/10.5281/zenodo.14587381.svg)](https://doi.org/10.5281/zenodo.14587381)

plotnine/guides/guide_legend.py

@@ -452,7 +452,7 @@ def key_heights(self) -> list[float]:
         If legend is horizontal, then key heights must be equal, so we
         use the maximum
         """
-        hs = [h for h, _ in self._key_dimensions]
+        hs = [h for _, h in self._key_dimensions]
         if self.is_horizontal:
             return [max(hs)] * len(hs)
         return hs