Typo fixes

+ added word to spelling.dat

python/core/qgsmaplayerrenderer.sip

@@ -19,7 +19,7 @@ thread, so it is necessary to keep all structures required for rendering away
 from the original map layer because it may change any time.
 
 Because the data needs to be copied (to avoid the need for locking),
-is is highly desirable to use copy-on-write where possible. This way,
+it is highly desirable to use copy-on-write where possible. This way,
 the overhead of copying (both memory and CPU) will be kept low.
 Qt containers and various Qt classes use implicit sharing.
 

scripts/spell_check/spelling.dat

@@ -438,6 +438,7 @@ altho:although
 althought:although
 altough:although
 alusion:allusion
+alway:always
 alwasy:always
 alwyas:always
 amalgomated:amalgamated

src/core/pal/labelposition.h

@@ -147,7 +147,7 @@ namespace pal
       int polygonIntersectionCost( PointSet *polygon ) const;
 
       /**
-       * Returns true if if any intersection between polygon and position exists.
+       * Returns true if any intersection between polygon and position exists.
       */
       bool intersectsWithPolygon( PointSet *polygon ) const;
 

src/core/qgsapplication.cpp

@@ -615,7 +615,7 @@ void QgsApplication::setUITheme( const QString &themeName )
     while ( !in.atEnd() )
     {
       QString line = in.readLine();
-      // This is is a variable
+      // This is a variable
       if ( line.startsWith( '@' ) )
       {
         int index = line.indexOf( ':' );

src/core/qgsmaplayerrenderer.h

@@ -30,7 +30,7 @@ class QgsFeedback;
  * from the original map layer because it may change any time.
  *
  * Because the data needs to be copied (to avoid the need for locking),
- * is is highly desirable to use copy-on-write where possible. This way,
+ * it is highly desirable to use copy-on-write where possible. This way,
  * the overhead of copying (both memory and CPU) will be kept low.
  * Qt containers and various Qt classes use implicit sharing.
  *

src/gui/qgsadvanceddigitizingdockwidget.cpp

@@ -490,7 +490,7 @@ void QgsAdvancedDigitizingDockWidget::updateCapacity( bool updateUIwithoutChange
     mAngleConstraint->setRelative( true );
   }
 
-  // distance is alway relative
+  // distance is always relative
   mLockDistanceButton->setEnabled( relativeCoordinates );
   mDistanceLineEdit->setEnabled( relativeCoordinates );
   if ( !relativeCoordinates )