Fix custom fonts not working as expected with PolyPatcher

src/main/java/pit12/platform/mixin/patcher/FontRendererHookMixin.java

@@ -0,0 +1,43 @@
+/*
+ * This file is part of 12pit.
+ *
+ * Copyright (C) 2026 The 12pit Authors and contributors <https://github.com/12src/12pit>
+ *
+ * 12pit is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * 12pit is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with 12pit. If not, see <https://www.gnu.org/licenses/>.
+ */
+package pit12.platform.mixin.patcher;
+
+import net.minecraft.client.gui.FontRenderer;
+import org.spongepowered.asm.mixin.Final;
+import org.spongepowered.asm.mixin.Mixin;
+import org.spongepowered.asm.mixin.Pseudo;
+import org.spongepowered.asm.mixin.Shadow;
+import org.spongepowered.asm.mixin.injection.At;
+import org.spongepowered.asm.mixin.injection.ModifyArg;
+
+@Pseudo
+@Mixin(targets = "club.sk1er.patcher.hooks.FontRendererHook", remap = false)
+public abstract class FontRendererHookMixin {
+    @Shadow
+    @Final
+    private FontRenderer fontRenderer;
+
+    // PolyPatcher's display-list key omits the font mode.
+    @ModifyArg(method = "renderStringAtPos", at = @At(value = "INVOKE",
+            target = "Lclub/sk1er/patcher/util/enhancement/hash/StringHash;<init>(Ljava/lang/String;FFFFZ)V"),
+            index = 0, remap = false, require = 1)
+    private String pit12$fontCacheKey(String text) {
+        return (fontRenderer.getUnicodeFlag() ? "\u0001" : "\u0000") + text;
+    }
+}

src/main/resources/mixins.pit12.json

@@ -17,6 +17,7 @@
     "network.NetworkPlayerInfoMixin",
     "projectile.EntityArrowMixin",
     "oneconfig.ModCardMixin",
+    "patcher.FontRendererHookMixin",
     "scoreboard.ScoreboardMixin",
     "world.WorldClientMixin",
     "input.MinecraftMixin",