Fix handling of surrogates in QBidiAlgorithm

qt/qtbase@94ce755
Facepunch · Jul 14, 2023 · d3bdd53 · d3bdd53
1 parent 3670fee
commit d3bdd53
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/valve/qtbase/src/gui/text/qtextengine.cpp b/valve/qtbase/src/gui/text/qtextengine.cpp
@@ -258,7 +258,7 @@ struct QBidiAlgorithm {
         for (int i = 0; i < length; ++i) {
             int pos = i;
             uint uc = text[i].unicode();
-            if (QChar::isHighSurrogate(uc) && i < length - 1) {
+            if (QChar::isHighSurrogate(uc) && i < length - 1 && text[i + 1].isLowSurrogate()) {
                 ++i;
                 analysis[i].bidiDirection = QChar::DirNSM;
                 uc = QChar::surrogateToUcs4(ushort(uc), text[i].unicode());