Replace toUtf8().data() by toUtf8().constData()

All your uses of toUtf8().data() actually just need a const char*
So use constData() that is semantically more correct, and documented
to be faster.

From http://doc.qt.io/qt-5/qbytearray.html#data
"For read-only access, constData() is faster because it never
causes a deep copy to occur."

python/core/auto_generated/expression/qgsexpression.sip.in

@@ -590,7 +590,7 @@ value. The value may be null.
     SIP_PYOBJECT __repr__();
 %MethodCode
     QString str = QStringLiteral( "<QgsExpression: '%1'>" ).arg( sipCpp->expression() );
-    sipRes = PyUnicode_FromString( str.toUtf8().data() );
+    sipRes = PyUnicode_FromString( str.toUtf8().constData() );
 %End
 
 };

python/core/auto_generated/geometry/qgscircle.sip.in

@@ -256,7 +256,7 @@ Returns true if the circle contains the ``point``.
     SIP_PYOBJECT __repr__();
 %MethodCode
     QString str = QStringLiteral( "<QgsCircle: %1>" ).arg( sipCpp->toString() );
-    sipRes = PyUnicode_FromString( str.toUtf8().data() );
+    sipRes = PyUnicode_FromString( str.toUtf8().constData() );
 %End
 };
 

python/core/auto_generated/geometry/qgscircularstring.sip.in

@@ -169,7 +169,7 @@ Sets the circular string's points
     SIP_PYOBJECT __repr__();
 %MethodCode
     QString str = QStringLiteral( "<QgsCircularString: %1>" ).arg( sipCpp->asWkt() );
-    sipRes = PyUnicode_FromString( str.toUtf8().data() );
+    sipRes = PyUnicode_FromString( str.toUtf8().constData() );
 %End
 
   protected:

python/core/auto_generated/geometry/qgscompoundcurve.sip.in

@@ -173,7 +173,7 @@ Appends first point if not already closed.
     SIP_PYOBJECT __repr__();
 %MethodCode
     QString str = QStringLiteral( "<QgsCompoundCurve: %1>" ).arg( sipCpp->asWkt() );
-    sipRes = PyUnicode_FromString( str.toUtf8().data() );
+    sipRes = PyUnicode_FromString( str.toUtf8().constData() );
 %End
 
   protected:

python/core/auto_generated/geometry/qgscurvepolygon.sip.in

@@ -219,7 +219,7 @@ Returns approximate rotation angle for a vertex. Usually average angle between a
     SIP_PYOBJECT __repr__();
 %MethodCode
     QString str = QStringLiteral( "<QgsCurvePolygon: %1>" ).arg( sipCpp->asWkt() );
-    sipRes = PyUnicode_FromString( str.toUtf8().data() );
+    sipRes = PyUnicode_FromString( str.toUtf8().constData() );
 %End
 
   protected:

python/core/auto_generated/geometry/qgsellipse.sip.in

@@ -251,7 +251,7 @@ Members will be truncated to the specified precision.
     SIP_PYOBJECT __repr__();
 %MethodCode
     QString str = QStringLiteral( "<QgsEllipse: %1>" ).arg( sipCpp->toString() );
-    sipRes = PyUnicode_FromString( str.toUtf8().data() );
+    sipRes = PyUnicode_FromString( str.toUtf8().constData() );
 %End
 
   protected:

python/core/auto_generated/geometry/qgsgeometry.sip.in

@@ -1297,7 +1297,7 @@ Exports the geometry to WKT
     SIP_PYOBJECT __repr__();
 %MethodCode
     QString str = QStringLiteral( "<QgsGeometry: %1>" ).arg( sipCpp->asWkt() );
-    sipRes = PyUnicode_FromString( str.toUtf8().data() );
+    sipRes = PyUnicode_FromString( str.toUtf8().constData() );
 %End
 
     QString asJson( int precision = 17 ) const;

python/core/auto_generated/geometry/qgslinestring.sip.in

@@ -330,7 +330,7 @@ of the curve.
     SIP_PYOBJECT __repr__();
 %MethodCode
     QString str = QStringLiteral( "<QgsLineString: %1>" ).arg( sipCpp->asWkt() );
-    sipRes = PyUnicode_FromString( str.toUtf8().data() );
+    sipRes = PyUnicode_FromString( str.toUtf8().constData() );
 %End
 
   protected:

python/core/auto_generated/geometry/qgsmulticurve.sip.in

@@ -59,7 +59,7 @@ Returns a copy of the multi curve, where each component curve has had its line d
     SIP_PYOBJECT __repr__();
 %MethodCode
     QString str = QStringLiteral( "<QgsMultiCurve: %1>" ).arg( sipCpp->asWkt() );
-    sipRes = PyUnicode_FromString( str.toUtf8().data() );
+    sipRes = PyUnicode_FromString( str.toUtf8().constData() );
 %End
 
 };

python/core/auto_generated/geometry/qgsmultilinestring.sip.in

@@ -56,7 +56,7 @@ Returns the geometry converted to the more generic curve type :py:class:`QgsMult
     SIP_PYOBJECT __repr__();
 %MethodCode
     QString str = QStringLiteral( "<QgsMultiLineString: %1>" ).arg( sipCpp->asWkt() );
-    sipRes = PyUnicode_FromString( str.toUtf8().data() );
+    sipRes = PyUnicode_FromString( str.toUtf8().constData() );
 %End
 
   protected:

python/core/auto_generated/geometry/qgsmultipoint.sip.in

@@ -58,7 +58,7 @@ Multi point geometry collection.
     SIP_PYOBJECT __repr__();
 %MethodCode
     QString str = QStringLiteral( "<QgsMultiPoint: %1>" ).arg( sipCpp->asWkt() );
-    sipRes = PyUnicode_FromString( str.toUtf8().data() );
+    sipRes = PyUnicode_FromString( str.toUtf8().constData() );
 %End
 
   protected:

python/core/auto_generated/geometry/qgsmultipolygon.sip.in

@@ -57,7 +57,7 @@ Returns the geometry converted to the more generic curve type :py:class:`QgsMult
     SIP_PYOBJECT __repr__();
 %MethodCode
     QString str = QStringLiteral( "<QgsMultiPolygon: %1>" ).arg( sipCpp->asWkt() );
-    sipRes = PyUnicode_FromString( str.toUtf8().data() );
+    sipRes = PyUnicode_FromString( str.toUtf8().constData() );
 %End
 
   protected:

python/core/auto_generated/geometry/qgspoint.sip.in

@@ -429,7 +429,7 @@ Angle undefined. Always returns 0.0
     SIP_PYOBJECT __repr__();
 %MethodCode
     QString str = QStringLiteral( "<QgsPoint: %1>" ).arg( sipCpp->asWkt() );
-    sipRes = PyUnicode_FromString( str.toUtf8().data() );
+    sipRes = PyUnicode_FromString( str.toUtf8().constData() );
 %End
 
   protected:

python/core/auto_generated/geometry/qgspolygon.sip.in

@@ -68,7 +68,7 @@ negative if the point lies outside the polygon.
     SIP_PYOBJECT __repr__();
 %MethodCode
     QString str = QStringLiteral( "<QgsPolygon: %1>" ).arg( sipCpp->asWkt() );
-    sipRes = PyUnicode_FromString( str.toUtf8().data() );
+    sipRes = PyUnicode_FromString( str.toUtf8().constData() );
 %End
 
   protected:

python/core/auto_generated/geometry/qgsrectangle.sip.in

@@ -325,7 +325,7 @@ Converts the rectangle to a 3D box, with the specified
     SIP_PYOBJECT __repr__();
 %MethodCode
     QString str = QStringLiteral( "<QgsRectangle: %1>" ).arg( sipCpp->asWktCoordinates() );
-    sipRes = PyUnicode_FromString( str.toUtf8().data() );
+    sipRes = PyUnicode_FromString( str.toUtf8().constData() );
 %End
 
 };

python/core/auto_generated/qgsfield.sip.in

@@ -333,7 +333,7 @@ by manual field configuration.
     SIP_PYOBJECT __repr__();
 %MethodCode
     QString str = QStringLiteral( "<QgsField: %1 (%2)>" ).arg( sipCpp->name() ).arg( sipCpp->typeName() );
-    sipRes = PyUnicode_FromString( str.toUtf8().data() );
+    sipRes = PyUnicode_FromString( str.toUtf8().constData() );
 %End
 
 }; // class QgsField

python/core/auto_generated/qgspointxy.sip.in

@@ -231,7 +231,7 @@ Multiply x and y by the given value
     SIP_PYOBJECT __repr__();
 %MethodCode
     QString str = QStringLiteral( "<QgsPointXY: %1>" ).arg( sipCpp->asWkt() );
-    sipRes = PyUnicode_FromString( str.toUtf8().data() );
+    sipRes = PyUnicode_FromString( str.toUtf8().constData() );
 %End
 
     int __len__();

src/app/qgisapp.cpp

@@ -10534,7 +10534,7 @@ void QgisApp::openURL( QString url, bool useQgisDocDirectory )
    * commandline application rather than a bundled application.
    */
   CFURLRef urlRef = CFURLCreateWithBytes( kCFAllocatorDefault,
-                                          reinterpret_cast<const UInt8 *>( url.toUtf8().data() ), url.length(),
+                                          reinterpret_cast<const UInt8 *>( url.toUtf8().constData() ), url.length(),
                                           kCFStringEncodingUTF8, nullptr );
   OSStatus status = LSOpenCFURLRef( urlRef, nullptr );
   status = 0; //avoid compiler warning

src/core/expression/qgsexpression.h

@@ -614,7 +614,7 @@ class CORE_EXPORT QgsExpression
     SIP_PYOBJECT __repr__();
     % MethodCode
     QString str = QStringLiteral( "<QgsExpression: '%1'>" ).arg( sipCpp->expression() );
-    sipRes = PyUnicode_FromString( str.toUtf8().data() );
+    sipRes = PyUnicode_FromString( str.toUtf8().constData() );
     % End
 #endif
 

src/core/geometry/qgscircle.h

@@ -251,7 +251,7 @@ class CORE_EXPORT QgsCircle : public QgsEllipse
     SIP_PYOBJECT __repr__();
     % MethodCode
     QString str = QStringLiteral( "<QgsCircle: %1>" ).arg( sipCpp->toString() );
-    sipRes = PyUnicode_FromString( str.toUtf8().data() );
+    sipRes = PyUnicode_FromString( str.toUtf8().constData() );
     % End
 #endif
 };

src/core/geometry/qgscircularstring.h

@@ -153,7 +153,7 @@ class CORE_EXPORT QgsCircularString: public QgsCurve
     SIP_PYOBJECT __repr__();
     % MethodCode
     QString str = QStringLiteral( "<QgsCircularString: %1>" ).arg( sipCpp->asWkt() );
-    sipRes = PyUnicode_FromString( str.toUtf8().data() );
+    sipRes = PyUnicode_FromString( str.toUtf8().constData() );
     % End
 #endif
 

src/core/geometry/qgscompoundcurve.h

@@ -153,7 +153,7 @@ class CORE_EXPORT QgsCompoundCurve: public QgsCurve
     SIP_PYOBJECT __repr__();
     % MethodCode
     QString str = QStringLiteral( "<QgsCompoundCurve: %1>" ).arg( sipCpp->asWkt() );
-    sipRes = PyUnicode_FromString( str.toUtf8().data() );
+    sipRes = PyUnicode_FromString( str.toUtf8().constData() );
     % End
 #endif
 

src/core/geometry/qgscurvepolygon.h

@@ -209,7 +209,7 @@ class CORE_EXPORT QgsCurvePolygon: public QgsSurface
     SIP_PYOBJECT __repr__();
     % MethodCode
     QString str = QStringLiteral( "<QgsCurvePolygon: %1>" ).arg( sipCpp->asWkt() );
-    sipRes = PyUnicode_FromString( str.toUtf8().data() );
+    sipRes = PyUnicode_FromString( str.toUtf8().constData() );
     % End
 #endif
 

src/core/geometry/qgsellipse.h

@@ -244,7 +244,7 @@ class CORE_EXPORT QgsEllipse
     SIP_PYOBJECT __repr__();
     % MethodCode
     QString str = QStringLiteral( "<QgsEllipse: %1>" ).arg( sipCpp->toString() );
-    sipRes = PyUnicode_FromString( str.toUtf8().data() );
+    sipRes = PyUnicode_FromString( str.toUtf8().constData() );
     % End
 #endif
 

src/core/geometry/qgsgeometry.h

@@ -1256,7 +1256,7 @@ class CORE_EXPORT QgsGeometry
     SIP_PYOBJECT __repr__();
     % MethodCode
     QString str = QStringLiteral( "<QgsGeometry: %1>" ).arg( sipCpp->asWkt() );
-    sipRes = PyUnicode_FromString( str.toUtf8().data() );
+    sipRes = PyUnicode_FromString( str.toUtf8().constData() );
     % End
 #endif
 

src/core/geometry/qgslinestring.h

@@ -360,7 +360,7 @@ class CORE_EXPORT QgsLineString: public QgsCurve
     SIP_PYOBJECT __repr__();
     % MethodCode
     QString str = QStringLiteral( "<QgsLineString: %1>" ).arg( sipCpp->asWkt() );
-    sipRes = PyUnicode_FromString( str.toUtf8().data() );
+    sipRes = PyUnicode_FromString( str.toUtf8().constData() );
     % End
 #endif
 

src/core/geometry/qgsmulticurve.h

@@ -77,7 +77,7 @@ class CORE_EXPORT QgsMultiCurve: public QgsGeometryCollection
     SIP_PYOBJECT __repr__();
     % MethodCode
     QString str = QStringLiteral( "<QgsMultiCurve: %1>" ).arg( sipCpp->asWkt() );
-    sipRes = PyUnicode_FromString( str.toUtf8().data() );
+    sipRes = PyUnicode_FromString( str.toUtf8().constData() );
     % End
 #endif
 

src/core/geometry/qgsmultilinestring.h

@@ -69,7 +69,7 @@ class CORE_EXPORT QgsMultiLineString: public QgsMultiCurve
     SIP_PYOBJECT __repr__();
     % MethodCode
     QString str = QStringLiteral( "<QgsMultiLineString: %1>" ).arg( sipCpp->asWkt() );
-    sipRes = PyUnicode_FromString( str.toUtf8().data() );
+    sipRes = PyUnicode_FromString( str.toUtf8().constData() );
     % End
 #endif
 

src/core/geometry/qgsmultipoint.h

@@ -70,7 +70,7 @@ class CORE_EXPORT QgsMultiPoint: public QgsGeometryCollection
     SIP_PYOBJECT __repr__();
     % MethodCode
     QString str = QStringLiteral( "<QgsMultiPoint: %1>" ).arg( sipCpp->asWkt() );
-    sipRes = PyUnicode_FromString( str.toUtf8().data() );
+    sipRes = PyUnicode_FromString( str.toUtf8().constData() );
     % End
 #endif
 

src/core/geometry/qgsmultipolygon.h

@@ -69,7 +69,7 @@ class CORE_EXPORT QgsMultiPolygon: public QgsMultiSurface
     SIP_PYOBJECT __repr__();
     % MethodCode
     QString str = QStringLiteral( "<QgsMultiPolygon: %1>" ).arg( sipCpp->asWkt() );
-    sipRes = PyUnicode_FromString( str.toUtf8().data() );
+    sipRes = PyUnicode_FromString( str.toUtf8().constData() );
     % End
 #endif
 

src/core/geometry/qgspoint.h

@@ -500,7 +500,7 @@ class CORE_EXPORT QgsPoint: public QgsAbstractGeometry
     SIP_PYOBJECT __repr__();
     % MethodCode
     QString str = QStringLiteral( "<QgsPoint: %1>" ).arg( sipCpp->asWkt() );
-    sipRes = PyUnicode_FromString( str.toUtf8().data() );
+    sipRes = PyUnicode_FromString( str.toUtf8().constData() );
     % End
 #endif
 

src/core/geometry/qgspolygon.h

@@ -88,7 +88,7 @@ class CORE_EXPORT QgsPolygon: public QgsCurvePolygon
     SIP_PYOBJECT __repr__();
     % MethodCode
     QString str = QStringLiteral( "<QgsPolygon: %1>" ).arg( sipCpp->asWkt() );
-    sipRes = PyUnicode_FromString( str.toUtf8().data() );
+    sipRes = PyUnicode_FromString( str.toUtf8().constData() );
     % End
 #endif
 

src/core/geometry/qgsrectangle.h

@@ -545,7 +545,7 @@ class CORE_EXPORT QgsRectangle
     SIP_PYOBJECT __repr__();
     % MethodCode
     QString str = QStringLiteral( "<QgsRectangle: %1>" ).arg( sipCpp->asWktCoordinates() );
-    sipRes = PyUnicode_FromString( str.toUtf8().data() );
+    sipRes = PyUnicode_FromString( str.toUtf8().constData() );
     % End
 #endif
 

src/core/qgsapplication.cpp

@@ -666,11 +666,11 @@ QString QgsApplication::resolvePkgPath()
       ABISYM( mBuildSourcePath ) = f.readLine().trimmed();
       ABISYM( mBuildOutputPath ) = f.readLine().trimmed();
       QgsDebugMsgLevel( QStringLiteral( "Running from build directory!" ), 4 );