Fix greater/lesser symbol bug in HTML conversion (#928)

* Fix issue with greater or lesser symbol in paragraph with formatting
* Add test coverage and make another fix to special case of mixing formats

novelwriter/core/tohtml.py

@@ -146,10 +146,25 @@ class ToHtml(Tokenizer):
         parStyle = None
         tmpResult = []
 
-        for tType, tLine, tText, tFormat, tStyle in self.theTokens:
+        for tType, tLine, tDirty, tFormat, tStyle in self.theTokens:
 
-            # Replace < and > before adding html tags
-            tText = tText.replace("<", "&lt;").replace(">", "&gt;")
+            # Replace < and > and recompute formatting positions
+            cText = []
+            i = 0
+            for c in tDirty:
+                if c == "<":
+                    cText.append("&lt;")
+                    tFormat = [[a + 3 if a > i else a, b, c] for a, b, c in tFormat]
+                    i += 4
+                elif c == ">":
+                    cText.append("&gt;")
+                    tFormat = [[a + 3 if a > i else a, b, c] for a, b, c in tFormat]
+                    i += 4
+                else:
+                    cText.append(c)
+                    i += 1
+
+            tText = "".join(cText)
 
             # Styles
             aStyle = []