Bug 776369 - Fix NullPointerException. r=bnicholson

mobile/android/base/FontSizePreference.java

@@ -136,10 +136,13 @@ class FontSizePreference extends DialogPreference {
         if (mCurrentOrientation != newConfig.orientation) {
             mCurrentOrientation = newConfig.orientation;
 
-            // Recalculate the mPreviewFontView dimensions since we have new screen dimensions.
+            // mPreviewFontView will be null if the dialog has not yet been shown.
-            setPreviewFontViewWidth();
+            if (mPreviewFontView != null) {
-            mPreviewFontViewHeightSet = false;
+                // Recalculate the mPreviewFontView dimensions since we have new screen dimensions.
-            setFontSizeToMaximum(); // Expects onGlobalLayout() to be called.
+                setPreviewFontViewWidth();
+                mPreviewFontViewHeightSet = false;
+                setFontSizeToMaximum(); // Expects onGlobalLayout() to be called.
+            }
         }
     }