From 1c460b6dc0863b85fbe931c6524cc7e11946defe Mon Sep 17 00:00:00 2001
From: Andrew Farkas <6060305+HactarCE@users.noreply.github.com>
Date: Thu, 4 Sep 2025 07:17:59 -0400
Subject: [PATCH] Skip zero-length layout job sections (#7430)

Fixes #7378

Includes a regression test that previously failed and now succeeds.

* [x] I have followed the instructions in the PR template

---------

Co-authored-by: Emil Ernerfeldt <emil.ernerfeldt@gmail.com>
Co-authored-by: Lucas Meurer <hi@lucasmerlin.me>
---
 crates/epaint/src/text/fonts.rs | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/crates/epaint/src/text/fonts.rs b/crates/epaint/src/text/fonts.rs
index f0d1c9c3..f9c1f4f8 100644
--- a/crates/epaint/src/text/fonts.rs
+++ b/crates/epaint/src/text/fonts.rs
@@ -930,7 +930,7 @@ impl GalleyCache {
                 } else {
                     // Section range overlaps with paragraph range
                     debug_assert!(
-                        section_range.start < section_range.end,
+                        section_range.start <= section_range.end,
                         "Bad byte_range: {section_range:?}"
                     );
                     let new_range = section_range.start.saturating_sub(start)
@@ -1162,6 +1162,13 @@ mod tests {
 
                 job
             },
+            {
+                // Regression test for <https://github.com/emilk/egui/issues/7378>
+                let mut job = LayoutJob::default();
+                job.append("\n", 0.0, TextFormat::default());
+                job.append("", 0.0, TextFormat::default());
+                job
+            },
         ]
     }