From 3d33d94a6caad2dfd08b464f1ad7c06262f2a880 Mon Sep 17 00:00:00 2001
From: Johannes Millan <johannes.millan@gmail.com>
Date: Sun, 11 Jan 2026 11:44:44 +0100
Subject: [PATCH] fix(snap): isolate fontconfig cache to fix GTK dialog
 rendering

Set FC_CACHEDIR to a Snap-specific directory to prevent ABI mismatches
with the host system's fontconfig cache. This fixes unreadable text
(tofu boxes) in GTK dialogs on Ubuntu Snap builds.

Fixes #4920
---
 electron-builder.yaml | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/electron-builder.yaml b/electron-builder.yaml
index ab72e428c..cfb70f849 100644
--- a/electron-builder.yaml
+++ b/electron-builder.yaml
@@ -67,6 +67,10 @@ snap:
   autoStart: true
   base: core22
   confinement: strict
+  environment:
+    # Fix for issue #4920: Isolate fontconfig cache to prevent GTK dialog rendering issues
+    # https://github.com/super-productivity/super-productivity/issues/4920
+    FC_CACHEDIR: $SNAP_USER_DATA/.cache/fontconfig
   plugs:
     - default
     - password-manager-service