Bug 686701 - Revise handling of preventDefault on touch events. r=mbrubeck

mobile/app/mobile.js

@@ -608,8 +608,8 @@ pref("image.mem.min_discard_timeout_ms", 10000);
 
 // enable touch events interfaces
 pref("dom.w3c_touch_events.enabled", true);
-pref("dom.w3c_touch_events.safetyX", 0); // escape borders in units of 1/240"
-pref("dom.w3c_touch_events.safetyY", 120); // escape borders in units of 1/240"
+pref("dom.w3c_touch_events.safetyX", 5); // escape borders in units of 1/240"
+pref("dom.w3c_touch_events.safetyY", 20); // escape borders in units of 1/240"
 
 #ifdef MOZ_SAFE_BROWSING
 // Safe browsing does nothing unless this pref is set

mobile/chrome/content/browser.js

@@ -1950,8 +1950,7 @@ const ContentTouchHandler = {
     // Check if the user touched near to one of the edges of the browser area
     // or if the urlbar is showing
     this.canCancelPan = (aX >= rect.left + kSafetyX) && (aX <= rect.right - kSafetyX) &&
-                        (aY >= rect.top  + kSafetyY) &&
-                        (bcr.top == 0 || Util.isTablet());
+                        (aY >= rect.top  + kSafetyY);
   },
 
   tapDown: function tapDown(aX, aY) {