Widgets: use QStringRef to optimize memory allocation

Replace substring functions that return QString with
corresponding functions that return QStringRef where
it's possible.

Create QString from QStringRef only where necessary.

Change-Id: I728c4338135f83d9cdff4d1ee1aed77f95d453b8
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
Reviewed-by: Marc Mutz <marc.mutz@kdab.com>

1 files changed, 3 insertions, 3 deletions

diff --git a/src/widgets/widgets/qtabbar.cpp b/src/widgets/widgets/qtabbar.cpp
index 7a192193e4..09b7cb9d24 100644
--- a/src/widgets/widgets/qtabbar.cpp
+++ b/src/widgets/widgets/qtabbar.cpp
@@ -1413,13 +1413,13 @@ static QString computeElidedText(Qt::TextElideMode mode, const QString &text)
     QString ret;
     switch (mode) {
     case Qt::ElideRight:
-        ret = text.left(2) + Ellipses;
+        ret = text.leftRef(2) + Ellipses;
         break;
     case Qt::ElideMiddle:
-        ret = text.left(1) + Ellipses + text.right(1);
+        ret = text.leftRef(1) + Ellipses + text.rightRef(1);
         break;
     case Qt::ElideLeft:
-        ret = Ellipses + text.right(2);
+        ret = Ellipses + text.rightRef(2);
         break;
     case Qt::ElideNone:
         ret = text;