From 139ccdd3241f7951c4149242e2f217b7e9343ba2 Mon Sep 17 00:00:00 2001
From: Antoine Beyeler <abeyeler@ab-ware.com>
Date: Tue, 7 Nov 2023 17:55:39 +0100
Subject: [PATCH] Fix header sizing issue

The issue originates from mixing row heights (as returned by `ui.text_style_height()` and font size. This PR fixes this discrepancy, leading to correct (relative) header sizing.
---
 examples/hello_world.rs |  9 +++++++++
 src/lib.rs              | 12 ++++++++++--
 2 files changed, 19 insertions(+), 2 deletions(-)

diff --git a/examples/hello_world.rs b/examples/hello_world.rs
index c2fc482..f92f115 100644
--- a/examples/hello_world.rs
+++ b/examples/hello_world.rs
@@ -35,6 +35,15 @@ vec.push(5);
     1. Sub item
 
 [^1]: A footnote
+
+# Header 1
+## Header 2
+### Header 3
+#### Header 4
+##### Header 5
+###### Header 6
+
+Some text.
             "#;
 
         egui::CentralPanel::default().show(ctx, |ui| {
diff --git a/src/lib.rs b/src/lib.rs
index cd3a939..7e762ed 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -653,8 +653,16 @@ impl CommonMarkViewerInternal {
         let mut text = RichText::new(text);
 
         if let Some(level) = self.text_style.heading {
-            let max_height = ui.text_style_height(&TextStyle::Heading);
-            let min_height = ui.text_style_height(&TextStyle::Body);
+            let max_height = ui
+                .style()
+                .text_styles
+                .get(&egui::TextStyle::Heading)
+                .map_or(32.0, |d| d.size);
+            let min_height = ui
+                .style()
+                .text_styles
+                .get(&egui::TextStyle::Body)
+                .map_or(14.0, |d| d.size);
             let diff = max_height - min_height;
             match level {
                 HeadingLevel::H1 => {