Use QStringRef to optimize memory allocation

Replace substring functions that return QString
with corresponding functions that return QStringRef.

Change-Id: I3c485f89352a1ee66076fba74fd486da9349c354
Reviewed-by: Edward Welbourne <edward.welbourne@qt.io>

1 files changed, 2 insertions, 2 deletions

diff --git a/src/gui/text/qtextengine.cpp b/src/gui/text/qtextengine.cpp
index d11f8c34b1..d9b648b170 100644
--- a/src/gui/text/qtextengine.cpp
+++ b/src/gui/text/qtextengine.cpp
@@ -2711,7 +2711,7 @@ static QString stringMidRetainingBidiCC(const QString &string,
             suffix += c;
     }
 
-    return prefix + ellidePrefix + string.mid(midStart, midLength) + ellideSuffix + suffix;
+    return prefix + ellidePrefix + string.midRef(midStart, midLength) + ellideSuffix + suffix;
 }
 
 QString QTextEngine::elidedText(Qt::TextElideMode mode, const QFixed &width, int flags, int from, int count) const
@@ -2874,7 +2874,7 @@ QString QTextEngine::elidedText(Qt::TextElideMode mode, const QFixed &width, int
         if (prevCharJoins(layoutData->string, rightPos))
             ellipsisText.append(QChar(0x200d) /* ZWJ */);
 
-        return layoutData->string.mid(from, leftPos - from) + ellipsisText + layoutData->string.mid(rightPos, to - rightPos);
+        return layoutData->string.midRef(from, leftPos - from) + ellipsisText + layoutData->string.midRef(rightPos, to - rightPos);
     }
 
     return layoutData->string.mid(from, to - from);