From d2e3794fa89da5106571b12b1d5f319ac7cfac53 Mon Sep 17 00:00:00 2001
From: Andy Terra <152812+airstrike@users.noreply.github.com>
Date: Thu, 5 Mar 2026 16:56:49 -0500
Subject: [PATCH] Log when default font family match fails due to weight
 mismatch

Uses missing_warn! (debug or warn depending on warn_on_missing_glyphs
feature) to surface when a requested family cannot be matched at the
desired weight, which is the root cause of variable font fallback
issues.
---
 src/font/fallback/mod.rs | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/src/font/fallback/mod.rs b/src/font/fallback/mod.rs
index 3b9aaaf..7ee9a6f 100644
--- a/src/font/fallback/mod.rs
+++ b/src/font/fallback/mod.rs
@@ -331,7 +331,14 @@ impl<'a> FontFallbackIter<'a> {
             }
 
             match (is_mono, default_font_match_key.as_ref()) {
-                (false, None) => break 'DEF_FAM,
+                (false, None) => {
+                    missing_warn!(
+                        "No default font match for {:?} at weight {}",
+                        self.default_families[self.default_i - 1],
+                        self.ideal_weight.0,
+                    );
+                    break 'DEF_FAM;
+                }
                 (false, Some(m_key)) => {
                     if let Some(font) = self.font_system.get_font(m_key.id, self.ideal_weight) {
                         return Some(font);