diff --git a/src/js/tools/drawing/ShiftIndex.js b/src/js/tools/drawing/ShiftIndex.js
index 954d1376..510fc027 100644
--- a/src/js/tools/drawing/ShiftIndex.js
+++ b/src/js/tools/drawing/ShiftIndex.js
@@ -5,88 +5,88 @@
  * @require pskl.utils
  */
 (function() {
-	var ns = $.namespace('pskl.tools.drawing');
+  var ns = $.namespace('pskl.tools.drawing');
 
-	ns.ShiftIndex = function() {
-		this.superclass.constructor.call(this);
+  ns.ShiftIndex = function() {
+    this.superclass.constructor.call(this);
 
-		this.toolId = 'tool-shift-index';
-		this.helpText = 'Shift Palette Color Index Brush';
-		this.shortcut = pskl.service.keyboard.Shortcuts.TOOL.SHIFT_INDEX;
+    this.toolId = 'tool-shift-index';
+    this.helpText = 'Shift Palette Color Index Brush';
+    this.shortcut = pskl.service.keyboard.Shortcuts.TOOL.SHIFT_INDEX;
 
-		this.tooltipDescriptors = [
-			{ 
-				description: 'Changes the color of pixels which are in the current palette. ' + 
-					'For each pixel it touches, the next or previous color within the palette will be used. ' + 
+    this.tooltipDescriptors = [
+      {
+        description: 'Changes the color of pixels which are in the current palette. ' +
+					'For each pixel it touches, the next or previous color within the palette will be used. ' +
 					'Use the primary and secondary colors in the palette to set ' +
 					'cell shade range boundaries. For example if your palette has: ' +
 					'- light red, dark red, light blue, dark blue - ' +
 					'you would want to set the primary colour to light red and secondary to dark red. ' +
 					'This will prevent the brush from cycling red to blue'
-			},
+      },
 			{ key: 'ctrl', description: 'Shift Index backwards' },
-		];
-	};
+    ];
+  };
 
-	pskl.utils.inherit(ns.ShiftIndex, ns.SimplePen);
+  pskl.utils.inherit(ns.ShiftIndex, ns.SimplePen);
 
 	/**
 	 * @Override
 	 */
-	ns.ShiftIndex.prototype.applyToolAt = function(col, row, frame, overlay, event) {
-		if (row !== this.previousRow || col !== this.previousCol) {
-			var penSize = pskl.app.penSizeService.getPenSize();
-			var points = pskl.PixelUtils.resizePixel(col, row, penSize);
-			points.forEach(
+  ns.ShiftIndex.prototype.applyToolAt = function(col, row, frame, overlay, event) {
+    if (row !== this.previousRow || col !== this.previousCol) {
+      var penSize = pskl.app.penSizeService.getPenSize();
+      var points = pskl.PixelUtils.resizePixel(col, row, penSize);
+      points.forEach(
 				function(point) {
-					var modifiedColor = this.getModifiedColor_(point[0], point[1], frame, overlay, event);
-					this.draw(modifiedColor, point[0], point[1], frame, overlay);
-				}.bind(this)
+  var modifiedColor = this.getModifiedColor_(point[0], point[1], frame, overlay, event);
+  this.draw(modifiedColor, point[0], point[1], frame, overlay);
+}.bind(this)
 			);
-		}
-		this.previousCol = col;
-		this.previousRow = row;
-	};
+    }
+    this.previousCol = col;
+    this.previousRow = row;
+  };
 
-	ns.ShiftIndex.prototype.getModifiedColor_ = function(col, row, frame, overlay, event) {
-		var pixelColor = frame.getPixel(col, row);
-		var isTransparent = pixelColor === pskl.utils.colorToInt(Constants.TRANSPARENT_COLOR);
-		if (isTransparent) {
+  ns.ShiftIndex.prototype.getModifiedColor_ = function(col, row, frame, overlay, event) {
+    var pixelColor = frame.getPixel(col, row);
+    var isTransparent = pixelColor === pskl.utils.colorToInt(Constants.TRANSPARENT_COLOR);
+    if (isTransparent) {
 		// Ignore transparent pixels.
-		return Constants.TRANSPARENT_COLOR;
-		}
+      return Constants.TRANSPARENT_COLOR;
+    }
 
-		var overlayColor = overlay.getPixel(col, row);
-		var isPixelModified = overlayColor !== pskl.utils.colorToInt(Constants.TRANSPARENT_COLOR);
-		if (isPixelModified) {
-		// This pixel was already updated by the tool, reuse the current color 
+    var overlayColor = overlay.getPixel(col, row);
+    var isPixelModified = overlayColor !== pskl.utils.colorToInt(Constants.TRANSPARENT_COLOR);
+    if (isPixelModified) {
+		// This pixel was already updated by the tool, reuse the current color
 		// buffered in the overlay.
-		return overlayColor;
-		}
+      return overlayColor;
+    }
 
-		var backward = pskl.utils.UserAgent.isMac ? event.metaKey : event.ctrlKey;
-		var color = pskl.utils.intToHex(pixelColor);
-		var colorPalette = pskl.app.palettesListController.getSelectedPaletteColors_();
-		var startPoint = colorPalette.indexOf(pskl.app.selectedColorsService.getPrimaryColor());
-		colorPalette.splice(0,startPoint);
-		var index = colorPalette.indexOf(color);
-		var range = colorPalette.indexOf(pskl.app.selectedColorsService.getSecondaryColor()) + 1;
-		startPoint = index - (index % range);
-		var colorsInCycleRange = colorPalette.slice(startPoint, startPoint + range);
-		index = colorsInCycleRange.indexOf(color);
-		if (index !== -1) {
-			if (backward) {
-				index -= 1;
-			} else {
-				index += 1;
-			}
-			if (index < 0) {
-				index = 0;
-			} else if (index > colorsInCycleRange.length - 1) {
-				index = colorsInCycleRange.length - 1;
-			}
-			color = colorsInCycleRange[index];
-		}
-		return color;
-	};
+    var backward = pskl.utils.UserAgent.isMac ? event.metaKey : event.ctrlKey;
+    var color = pskl.utils.intToHex(pixelColor);
+    var colorPalette = pskl.app.palettesListController.getSelectedPaletteColors_();
+    var startPoint = colorPalette.indexOf(pskl.app.selectedColorsService.getPrimaryColor());
+    colorPalette.splice(0,startPoint);
+    var index = colorPalette.indexOf(color);
+    var range = colorPalette.indexOf(pskl.app.selectedColorsService.getSecondaryColor()) + 1;
+    startPoint = index - (index % range);
+    var colorsInCycleRange = colorPalette.slice(startPoint, startPoint + range);
+    index = colorsInCycleRange.indexOf(color);
+    if (index !== -1) {
+      if (backward) {
+        index -= 1;
+      } else {
+        index += 1;
+      }
+      if (index < 0) {
+        index = 0;
+      } else if (index > colorsInCycleRange.length - 1) {
+        index = colorsInCycleRange.length - 1;
+      }
+      color = colorsInCycleRange[index];
+    }
+    return color;
+  };
 })();