Keep section_index in Glyph to maintain support for MarkdownLabel

Author: juancampa

crates/epaint/src/text/text_layout.rs

@@ -666,9 +666,11 @@ fn galley_from_rows(
         num_indices += row.visuals.mesh.indices.len();
 
         row.section_index_at_start = u32::MAX; // No longer in use.
-        for glyph in &mut row.glyphs {
-            glyph.section_index = u32::MAX; // No longer in use.
-        }
+
+        // MEMBRANE: Keep these values since we use them to render Markdown
+        // for glyph in &mut row.glyphs {
+        //     glyph.section_index = u32::MAX; // No longer in use.
+        // }
     }
 
     let mut galley = Galley {

crates/epaint/src/text/text_layout_types.rs

@@ -677,7 +677,8 @@ pub struct Glyph {
     /// Only used during layout, then set to an invalid value in order to
     /// enable the paragraph-concat optimization path without having to
     /// adjust `section_index` when concatting.
-    pub(crate) section_index: u32,
+    /// MEMBRANE: Keep these values since we use them to render Markdown
+    pub section_index: u32,
 }
 
 impl Glyph {