fix typos

src/gui/qgsexpressionbuilderwidget.cpp

@@ -235,7 +235,7 @@ void QgsExpressionBuilderWidget::on_txtExpressionString_textChanged()
     lblPreview->setStyleSheet( "" );
     txtExpressionString->setToolTip( "" );
     lblPreview->setToolTip( "" );
-    // Return false for isVaild because a null expression is still invaild.
+    // Return false for isValid because a null expression is still invalid.
     emit expressionParsed( false );
     return;
   }
@@ -260,7 +260,7 @@ void QgsExpressionBuilderWidget::on_txtExpressionString_textChanged()
     }
     else
     {
-      // The feautre is invaild because we don't have one but that doesn't mean user can't
+      // The feature is invalid because we don't have one but that doesn't mean user can't
       // build a expression string.  They just get no preview.
       lblPreview->setText( "" );
     }

src/gui/qgsexpressionbuilderwidget.h

@@ -157,9 +157,9 @@ class GUI_EXPORT QgsExpressionBuilderWidget : public QWidget, private Ui::QgsExp
     /** Emited when the user changes the expression in the widget.
       * Users of this widget should connect to this signal to decide if to let the user
       * continue.
-      * @param isVaild Is true if the expression the user has typed is vaild.
+      * @param isValid Is true if the expression the user has typed is valid.
       */
-    void expressionParsed( bool isVaild );
+    void expressionParsed( bool isValid );
 
   private:
     void fillFieldValues( int fieldIndex, int countLimit );

src/providers/grass/qgsgrass.h

@@ -218,7 +218,7 @@ class QgsGrass
     static GRASS_LIB_EXPORT QList<QgsGrass::Color> colors( QString gisdbase, QString location,
         QString mapset, QString map );
 
-    // ! Get map value / feautre info
+    // ! Get map value / feature info
     static GRASS_LIB_EXPORT QMap<QString, QString> query( QString gisdbase, QString location,
         QString mapset, QString map, MapType type, double x, double y );
 

src/providers/spatialite/qgsspatialiteprovider.cpp

@@ -443,7 +443,7 @@ QgsSpatiaLiteProvider::QgsSpatiaLiteProvider( QString const &uri )
     return;
   }
   enabledCapabilities = QgsVectorDataProvider::SelectAtId | QgsVectorDataProvider::SelectGeometryAtId;
-  if (( mTableBased | mViewBased ) &&  !mReadOnly )
+  if (( mTableBased || mViewBased ) &&  !mReadOnly )
   {
     // enabling editing only for Tables [excluding Views and VirtualShapes]
     enabledCapabilities |= QgsVectorDataProvider::DeleteFeatures;