[fix #13503] avoid crash when switch between style widgets and renderer cannot be applied to layer

slarosa · nyalldawson · commit 2702cb1565b7 · 2015-10-07T18:32:39.000+11:00
diff --git a/src/gui/symbology-ng/qgsrendererv2propertiesdialog.cpp b/src/gui/symbology-ng/qgsrendererv2propertiesdialog.cpp
@@ -201,7 +201,7 @@ void QgsRendererV2PropertiesDialog::rendererChanged()
     mActiveWidget = w;
     stackedWidget->addWidget( mActiveWidget );
     stackedWidget->setCurrentWidget( mActiveWidget );
-    if ( mMapCanvas )
+    if ( mMapCanvas && mActiveWidget->renderer() )
       mActiveWidget->setMapCanvas( mMapCanvas );
   }
   else

Original file line number	Diff line number	Diff line change
`@@ -201,7 +201,7 @@ void QgsRendererV2PropertiesDialog::rendererChanged()`
`201`	`201`	`mActiveWidget = w;`
`202`	`202`	`stackedWidget->addWidget( mActiveWidget );`
`203`	`203`	`stackedWidget->setCurrentWidget( mActiveWidget );`
`204`		`- if ( mMapCanvas )`
	`204`	`+ if ( mMapCanvas && mActiveWidget->renderer() )`
`205`	`205`	`mActiveWidget->setMapCanvas( mMapCanvas );`
`206`	`206`	`}`
`207`	`207`	`else`