Commit e70a61f0 authored by Hiroyuki Ikezoe's avatar Hiroyuki Ikezoe
Browse files

Bug 1777052 - Skip counting scroll events where the scroll position is... 

Bug 1777052 - Skip counting scroll events where the scroll position is unchanged in test_mousecapture.xhtml. r=botond

Differential Revision: https://phabricator.services.mozilla.com/D174050
parent 5f419053

toolkit/content/tests/mochitest/test_mousecapture.xhtml

+13 −1
Original line number Diff line number Diff line
@@ -73,10 +73,22 @@ function selectionScrollCheck() { 
  var element = otherWindow.document.documentElement;



  var count = 0;

  let previousScrollPosition = 0;



  function selectionScrollDone() {

    // Don't count unchanged scroll position.

    // There's a bug that scroll events get fired during reconstructing scroll

    // frames even if the scroll position is unchanged (bug 1825470). We need to

    // ignore the unchanged scroll events here.

    if (otherWindow.scrollY == previousScrollPosition) {

      return;

    }

    previousScrollPosition = otherWindow.scrollY;



    // wait for 6 scroll events to occur

    if (count++ < 6)

    if (count++ < 6) {

      return;

    }



    otherWindow.removeEventListener("scroll", selectionScrollDone);