Spelling

python/core/qgsdataitem.sip

@@ -157,8 +157,8 @@ Create new data item.
     virtual bool handleDoubleClick();
 %Docstring
  Called when a user double clicks on the item. Subclasses should return true
- if they have implemented a double click handler and do not want the default
- double click behaviour for items.
+ if they have implemented a double-click handler and do not want the default
+ double-click behavior for items.
 .. versionadded:: 3.0
  :rtype: bool
 %End

src/core/qgsdataitem.h

@@ -158,8 +158,8 @@ class CORE_EXPORT QgsDataItem : public QObject
 
     /**
      * Called when a user double clicks on the item. Subclasses should return true
-     * if they have implemented a double click handler and do not want the default
-     * double click behaviour for items.
+     * if they have implemented a double-click handler and do not want the default
+     * double-click behavior for items.
      * \since QGIS 3.0
      */
     virtual bool handleDoubleClick();

src/gui/qgsbrowserdockwidget.cpp

@@ -164,7 +164,7 @@ void QgsBrowserDockWidget::itemDoubleClicked( const QModelIndex &index )
   if ( item->handleDoubleClick() )
     return;
   else
-    addLayerAtIndex( index ); // default double click handler
+    addLayerAtIndex( index ); // default double-click handler
 }
 
 void QgsBrowserDockWidget::showContextMenu( QPoint pt )