Compare the char formats.

src/plugins/texteditor/syntaxhighlighter.cpp

@@ -687,6 +687,21 @@ QTextBlock SyntaxHighlighter::currentBlock() const
     return d->currentBlock;
 }
 
+static bool isSimilarCharFormat(const QTextCharFormat &format, const QTextCharFormat &other)
+{
+    if (format.foreground() != other.foreground())
+        return false;
+    else if (format.background() != other.background())
+        return false;
+    else if (format.underlineStyle() != other.underlineStyle())
+        return false;
+    else if (format.underlineColor() != other.underlineColor())
+        return false;
+    else if (format.font() != other.font())
+        return false;
+    return true;
+}
+
 void SyntaxHighlighter::setExtraAdditionalFormats(const QTextBlock& block,
                                                   const QList<QTextLayout::FormatRange> &formats)
 {
@@ -712,7 +727,8 @@ void SyntaxHighlighter::setExtraAdditionalFormats(const QTextBlock& block,
         if (it->format.property(QTextFormat::UserProperty).toBool()) {
             if (skip < formats.size()
                     && it->start == formats.at(skip).start
-                    && it->length == formats.at(skip).length) {
+                    && it->length == formats.at(skip).length
+                    && isSimilarCharFormat(it->format, formats.at(skip).format)) {
                 ++skip;
                 ++it;
             } else {