Fix crash in QgsLineStringV2::append if non z/m line appended

nyalldawson · nyalldawson · commit b8706eae4cf1 · 2015-11-26T08:46:05.000+11:00
to a LineString with z/m

(cherry-picked from ff3657)
diff --git a/src/core/geometry/qgslinestringv2.cpp b/src/core/geometry/qgslinestringv2.cpp
@@ -300,8 +300,28 @@ void QgsLineStringV2::append( const QgsLineStringV2* line )
   }
 
   mCoords += line->mCoords;
-  mZ += line->mZ;
-  mM += line->mM;
+
+  if ( line->is3D() )
+  {
+    mZ += line->mZ;
+  }
+  else
+  {
+    // if append line does not have z coordinates, fill with 0 to match number of points in final line
+    mZ.insert( mZ.count(), mX.size() - mZ.size(), 0 );
+  }
+
+  if ( line->is3D() )
+  {
+    mM += line->mM;
+  }
+  else
+  {
+    // if append line does not have m values, fill with 0 to match number of points in final line
+    mM.insert( mM.count(), mX.size() - mM.size(), 0 );
+  }
+
+  mBoundingBox = QgsRectangle(); //set bounding box invalid
 }
 
 void QgsLineStringV2::draw( QPainter& p ) const
