From 4f3bd476d5767d98ab31695b33d54b58e008d9af Mon Sep 17 00:00:00 2001
From: Damien Elmes <gpg@ankiweb.net>
Date: Mon, 16 Dec 2019 14:39:54 +1000
Subject: [PATCH] fix incorrect marks not showing properly when typing answer

https://anki.tenderapp.com/discussions/ankidesktop/37513-thai-superscripts-not-checked
---
 aqt/reviewer.py | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/aqt/reviewer.py b/aqt/reviewer.py
index f01fcbd9f..03b228310 100644
--- a/aqt/reviewer.py
+++ b/aqt/reviewer.py
@@ -440,12 +440,14 @@ Please run Tools>Empty Cards""")
         else:
             res = ""
             for ok, txt in givenElems:
+                txt = self._noLoneMarks(txt)
                 if ok:
                     res += good(txt)
                 else:
                     res += bad(txt)
             res += "<br>&darr;<br>"
             for ok, txt in correctElems:
+                txt = self._noLoneMarks(txt)
                 if ok:
                     res += good(txt)
                 else:
@@ -453,6 +455,13 @@ Please run Tools>Empty Cards""")
         res = "<div><code id=typeans>" + res + "</code></div>"
         return res
 
+    def _noLoneMarks(self, s):
+        # ensure a combining character at the start does not join to
+        # previous text
+        if s and ucd.category(s[0]).startswith("M"):
+            return "\xa0" + s
+        return s
+
     def _getTypedAnswer(self):
         self.web.evalWithCallback("typeans ? typeans.value : null", self._onTypedAnswer)