Fix bbox-based GetLegendGraphic for CRS with inverted axes (e.g. EPSG:4326)

Author: wonder-sk

src/providers/wms/qgswmsprovider.cpp

@@ -3004,7 +3004,8 @@ QUrl QgsWmsProvider::getLegendGraphicFullURL( double scale, const QgsRectangle&
 
   if ( useContextualWMSLegend )
   {
-    setQueryItem( url, "BBOX", toParamValue( visibleExtent ) );
+    bool changeXY = mCaps.shouldInvertAxisOrientation( mImageCrs );
+    setQueryItem( url, "BBOX", toParamValue( visibleExtent, changeXY ) );
     setSRSQueryItem( url );
   }
 

src/providers/wms/qgswmsprovider.h

@@ -426,7 +426,7 @@ class QgsWmsProvider : public QgsRasterDataProvider
      *
      * \note it does not perform any escape
      */
-    QString toParamValue( const QgsRectangle& rect, bool changeXY = false );
+    QString toParamValue( const QgsRectangle& rect, bool changeXY );
 
     /* \brief add SRS or CRS parameter */
     void setSRSQueryItem( QUrl& url );