Improve resize of Treeview in page labels dialog (#1872)

1. If user grows dialog horizontally, stretch the columns
2. Set the row height based on the font size (affects all
Treeviews: HTML internal links; Compose Help dialog;
Command Palette; Unicode Search dialog results

Author: windymilla

src/guiguts/page_details.py

@@ -145,7 +145,7 @@ def __init__(self, page_details: PageDetails) -> None:
                 f"#{col + 1}",
                 minwidth=10,
                 width=widths[col],
-                stretch=False,
+                stretch=True,
                 anchor=tk.CENTER,
             )
             self.list.heading(f"#{col + 1}", text=column)

src/guiguts/widgets.py

@@ -764,6 +764,17 @@ def __init__(
             bordercolor=[("focus", bg_color)],
             relief=[("focus", "solid")],
         )
+        # Ensure rowheight is sufficient for font size
+        fnt = get_global_font()
+        rowheight = fnt.metrics("linespace") + 4
+        themed_style().configure(
+            "Custom.Treeview",
+            rowheight=rowheight,
+        )
+        themed_style().configure(
+            "Custom.Treeview.Heading",
+            rowheight=rowheight,
+        )
 
         super().__init__(parent, style="Custom.Treeview", **kwargs)
         self.bind("<Home>", lambda _e: self.select_and_focus_by_index(0))