<?xml version="1.0" encoding="UTF-8" standalone="yes" ?>
<!DOCTYPE bugzilla SYSTEM "https://bugs.webkit.org/page.cgi?id=bugzilla.dtd">

<bugzilla version="5.0.4.1"
          urlbase="https://bugs.webkit.org/"
          
          maintainer="admin@webkit.org"
>

    <bug>
          <bug_id>132421</bug_id>
          
          <creation_ts>2014-05-01 00:15:05 -0700</creation_ts>
          <short_desc>fast/multicol/fixed-stack.html failing since introduction.</short_desc>
          <delta_ts>2022-01-04 23:15:04 -0800</delta_ts>
          <reporter_accessible>1</reporter_accessible>
          <cclist_accessible>1</cclist_accessible>
          <classification_id>1</classification_id>
          <classification>Unclassified</classification>
          <product>WebKit</product>
          <component>Layout and Rendering</component>
          <version>528+ (Nightly build)</version>
          <rep_platform>Unspecified</rep_platform>
          <op_sys>Unspecified</op_sys>
          <bug_status>NEW</bug_status>
          <resolution></resolution>
          
          <see_also>https://bugs.webkit.org/show_bug.cgi?id=159214</see_also>
          <bug_file_loc></bug_file_loc>
          <status_whiteboard></status_whiteboard>
          <keywords></keywords>
          <priority>P2</priority>
          <bug_severity>Normal</bug_severity>
          <target_milestone>---</target_milestone>
          
          
          <everconfirmed>1</everconfirmed>
          <reporter name="Andreas Kling">kling</reporter>
          <assigned_to name="Dave Hyatt">hyatt</assigned_to>
          <cc>ap</cc>
    
    <cc>bfulgham</cc>
    
    <cc>clopez</cc>
    
    <cc>darin</cc>
    
    <cc>kling</cc>
    
    <cc>simon.fraser</cc>
    
    <cc>thorton</cc>
          

      

      

      

          <comment_sort_order>oldest_to_newest</comment_sort_order>  
          <long_desc isprivate="0" >
    <commentid>1005682</commentid>
    <comment_count>0</comment_count>
    <who name="Andreas Kling">kling</who>
    <bug_when>2014-05-01 00:15:05 -0700</bug_when>
    <thetext>This test was added in r168076 and is failing on bots since.

It appears to be a problem with compositing vs non-compositing code paths. There is a small antialiasing difference in the output, and it goes away if I force the -expected.html to use accelerate compositing as well.</thetext>
  </long_desc><long_desc isprivate="0" >
    <commentid>1005683</commentid>
    <comment_count>1</comment_count>
    <who name="Andreas Kling">kling</who>
    <bug_when>2014-05-01 00:18:44 -0700</bug_when>
    <thetext>Skipped: &lt;http://trac.webkit.org/changeset/168090&gt;</thetext>
  </long_desc><long_desc isprivate="0" >
    <commentid>1005716</commentid>
    <comment_count>2</comment_count>
    <who name="Tim Horton">thorton</who>
    <bug_when>2014-05-01 06:54:31 -0700</bug_when>
    <thetext>Seems like this should have gotten ImageOnlyFailure&apos;d, not Skipped! That way we&apos;ll still learn if the text parts differ and just ignore the bad image parts.</thetext>
  </long_desc><long_desc isprivate="0" >
    <commentid>1005748</commentid>
    <comment_count>3</comment_count>
    <who name="Dave Hyatt">hyatt</who>
    <bug_when>2014-05-01 09:41:47 -0700</bug_when>
    <thetext>Hmmm not sure how to fix. The whole point was to compare compositing vs. non-compositing, so if the images aren&apos;t going to match I&apos;m not sure how to test this issue.</thetext>
  </long_desc><long_desc isprivate="0" >
    <commentid>1005749</commentid>
    <comment_count>4</comment_count>
    <who name="Dave Hyatt">hyatt</who>
    <bug_when>2014-05-01 09:42:06 -0700</bug_when>
    <thetext>I guess I should turn it into a pixel test.</thetext>
  </long_desc><long_desc isprivate="0" >
    <commentid>1005750</commentid>
    <comment_count>5</comment_count>
    <who name="Alexey Proskuryakov">ap</who>
    <bug_when>2014-05-01 09:43:23 -0700</bug_when>
    <thetext>Updated the expectation in &lt;http://trac.webkit.org/r168106&gt;.</thetext>
  </long_desc><long_desc isprivate="0" >
    <commentid>1005751</commentid>
    <comment_count>6</comment_count>
    <who name="Tim Horton">thorton</who>
    <bug_when>2014-05-01 09:49:55 -0700</bug_when>
    <thetext>(In reply to comment #3)
&gt; Hmmm not sure how to fix. The whole point was to compare compositing vs. non-compositing, so if the images aren&apos;t going to match I&apos;m not sure how to test this issue.

It would be nice to have a link to the failure here so we can see what kind of AA differences are occuring. Ideally there should be no differences between the two modes, and you shouldn&apos;t have to worry about this when writing a test.

Andreas, did it fail on WebKit2 bots as well? (i.e. was the issue with the whole webview being in compositing/not, which only switches on WebKit1 bots, or with the content specifically being in compositing/not, which switches on both).</thetext>
  </long_desc><long_desc isprivate="0" >
    <commentid>1005759</commentid>
    <comment_count>7</comment_count>
    <who name="Alexey Proskuryakov">ap</who>
    <bug_when>2014-05-01 10:10:02 -0700</bug_when>
    <thetext>http://build.webkit.org/results/Apple%20MountainLion%20Release%20WK2%20(Tests)/r168079%20(18114)/fast/multicol/fixed-stack-diffs.html

http://build.webkit.org/results/Apple%20Mavericks%20Release%20WK2%20(Tests)/r168087%20(5354)/fast/multicol/fixed-stack-diffs.html

It was WK2 only, for added surprise :). Failing consistently on all Mac WK2 bots.</thetext>
  </long_desc><long_desc isprivate="0" >
    <commentid>1029999</commentid>
    <comment_count>8</comment_count>
    <who name="Carlos Alberto Lopez Perez">clopez</who>
    <bug_when>2014-08-19 04:36:59 -0700</bug_when>
    <thetext>This test pass on GTK (WK2)</thetext>
  </long_desc><long_desc isprivate="0" >
    <commentid>1044014</commentid>
    <comment_count>9</comment_count>
    <who name="Alexey Proskuryakov">ap</who>
    <bug_when>2014-10-24 12:12:05 -0700</bug_when>
    <thetext>As of Yosemite, the test now fails on WK1 too, because it actually started to use compositing.

Updated expectations in &lt;http://trac.webkit.org/r175170&gt;.</thetext>
  </long_desc><long_desc isprivate="0" >
    <commentid>1063171</commentid>
    <comment_count>10</comment_count>
    <who name="Brent Fulgham">bfulgham</who>
    <bug_when>2015-01-21 14:20:04 -0800</bug_when>
    <thetext>(In reply to comment #9)
&gt; As of Yosemite, the test now fails on WK1 too, because it actually started
&gt; to use compositing.
&gt; 
&gt; Updated expectations in &lt;http://trac.webkit.org/r175170&gt;.

After this test expectation change, Windows now passes as well.</thetext>
  </long_desc><long_desc isprivate="0" >
    <commentid>1826208</commentid>
    <comment_count>11</comment_count>
      <attachid>447777</attachid>
    <who name="Simon Fraser (smfr)">simon.fraser</who>
    <bug_when>2021-12-21 20:51:31 -0800</bug_when>
    <thetext>Created attachment 447777
Patch</thetext>
  </long_desc>
      
          <attachment
              isobsolete="0"
              ispatch="1"
              isprivate="0"
          >
            <attachid>447777</attachid>
            <date>2021-12-21 20:51:31 -0800</date>
            <delta_ts>2022-01-04 23:15:04 -0800</delta_ts>
            <desc>Patch</desc>
            <filename>bug-132421-20211221205130.patch</filename>
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            <attacher name="Simon Fraser (smfr)">simon.fraser</attacher>
            
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    </bug>

</bugzilla>