monospace font in html editor

https://forums.ankiweb.net/t/change-default-font-of-html-edit-mode-to-a-monospaced-font/7833

qt/aqt/editor.py

@@ -589,6 +589,9 @@ class Editor:
         qconnect(
             form.buttonBox.helpRequested, lambda: openHelp(HelpPage.EDITING_FEATURES)
         )
+        font = QFont("Courier")
+        font.setStyleHint(QFont.TypeWriter)
+        form.textEdit.setFont(font)
         form.textEdit.setPlainText(self.note.fields[field])
         d.show()
         form.textEdit.moveCursor(QTextCursor.End)

qt/aqt/forms/edithtml.ui

@@ -1,3 +1,4 @@
+<?xml version="1.0" encoding="UTF-8"?>
 <ui version="4.0">
  <class>Dialog</class>
  <widget class="QDialog" name="Dialog">
@@ -14,11 +15,7 @@
   </property>
   <layout class="QVBoxLayout" name="verticalLayout">
    <item>
-    <widget class="QTextEdit" name="textEdit" >
-     <property name="acceptRichText" >
-      <bool>false</bool>
-     </property>
-    </widget>
+    <widget class="QPlainTextEdit" name="textEdit"/>
    </item>
    <item>
     <widget class="QDialogButtonBox" name="buttonBox">