From 4e8c992be1b7d628ba4168a54355fedb0b0e6804 Mon Sep 17 00:00:00 2001
From: Lee Doughty <32392044+leedoughty@users.noreply.github.com>
Date: Tue, 16 Dec 2025 16:23:40 +0000
Subject: [PATCH] fix: prevent <br> from appearing as text in error message
 (#4451)

* Update error text format to use RichText rather than PlainText

* Set CardTypeError messages as rich text to allow HTML formatting

* Use CardTypeError from anki.errors module
---
 qt/aqt/errors.py | 19 +++++++++++++++----
 1 file changed, 15 insertions(+), 4 deletions(-)

diff --git a/qt/aqt/errors.py b/qt/aqt/errors.py
index a6d9251e2..89e15246e 100644
--- a/qt/aqt/errors.py
+++ b/qt/aqt/errors.py
@@ -14,7 +14,7 @@ from markdown import markdown
 
 import aqt
 from anki.collection import HelpPage
-from anki.errors import BackendError, Interrupted
+from anki.errors import BackendError, CardTypeError, Interrupted
 from anki.utils import is_win
 from aqt.addons import AddonManager, AddonMeta
 from aqt.qt import *
@@ -36,6 +36,14 @@ def show_exception(*, parent: QWidget, exception: Exception) -> None:
     global _mbox
     error_lines = []
     help_page = HelpPage.TROUBLESHOOTING
+
+    # default to PlainText
+    text_format = Qt.TextFormat.PlainText
+
+    # set CardTypeError messages as rich text to allow HTML formatting
+    if isinstance(exception, CardTypeError):
+        text_format = Qt.TextFormat.RichText
+
     if isinstance(exception, BackendError):
         if exception.context:
             error_lines.append(exception.context)
@@ -51,7 +59,7 @@ def show_exception(*, parent: QWidget, exception: Exception) -> None:
         )
     error_text = "\n".join(error_lines)
     print(error_lines)
-    _mbox = _init_message_box(str(exception), error_text, help_page)
+    _mbox = _init_message_box(str(exception), error_text, help_page, text_format)
     _mbox.show()
 
 
@@ -171,7 +179,10 @@ if not os.environ.get("DEBUG"):
 
 
 def _init_message_box(
-    user_text: str, debug_text: str, help_page=HelpPage.TROUBLESHOOTING
+    user_text: str,
+    debug_text: str,
+    help_page=HelpPage.TROUBLESHOOTING,
+    text_format=Qt.TextFormat.PlainText,
 ):
     global _mbox
 
@@ -179,7 +190,7 @@ def _init_message_box(
     _mbox.setWindowTitle("Anki")
     _mbox.setText(user_text)
     _mbox.setIcon(QMessageBox.Icon.Warning)
-    _mbox.setTextFormat(Qt.TextFormat.PlainText)
+    _mbox.setTextFormat(text_format)
 
     def show_help():
         openHelp(help_page)