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<!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>188471</bug_id>
          
          <creation_ts>2018-08-10 08:29:21 -0700</creation_ts>
          <short_desc>Tons of rendering artifacts with AC enabled in https://lichess.org</short_desc>
          <delta_ts>2018-08-13 12:51:55 -0700</delta_ts>
          <reporter_accessible>1</reporter_accessible>
          <cclist_accessible>1</cclist_accessible>
          <classification_id>1</classification_id>
          <classification>Unclassified</classification>
          <product>WebKit</product>
          <component>WebKitGTK</component>
          <version>WebKit Nightly Build</version>
          <rep_platform>Unspecified</rep_platform>
          <op_sys>Unspecified</op_sys>
          <bug_status>RESOLVED</bug_status>
          <resolution>DUPLICATE</resolution>
          <dup_id>188377</dup_id>
          
          <bug_file_loc>https://lichess.org</bug_file_loc>
          <status_whiteboard></status_whiteboard>
          <keywords></keywords>
          <priority>P2</priority>
          <bug_severity>Critical</bug_severity>
          <target_milestone>---</target_milestone>
          
          
          <everconfirmed>1</everconfirmed>
          <reporter name="Sergio Villar Senin">svillar</reporter>
          <assigned_to name="Nobody">webkit-unassigned</assigned_to>
          <cc>bugs-noreply</cc>
    
    <cc>mcatanzaro</cc>
          

      

      

      

          <comment_sort_order>oldest_to_newest</comment_sort_order>  
          <long_desc isprivate="0" >
    <commentid>1449270</commentid>
    <comment_count>0</comment_count>
    <who name="Sergio Villar Senin">svillar</who>
    <bug_when>2018-08-10 08:29:21 -0700</bug_when>
    <thetext>Steps to reproduce:

1- Goto https://lichess.org
2- Move the pointer around, hovering the various UI widgets in the page, also click on some menu (even start a game if you fancy)

Expected outcome:
Good rendering

Actual outcome:
Tons of rendering artifacts, a lot of stuff drawn on places where they should not be

Looked like the typical issue with AC, so I tried WEBKIT_DISABLE_COMPOSITING_MODE=1 and then everything works fine.</thetext>
  </long_desc><long_desc isprivate="0" >
    <commentid>1449271</commentid>
    <comment_count>1</comment_count>
    <who name="Sergio Villar Senin">svillar</who>
    <bug_when>2018-08-10 08:29:59 -0700</bug_when>
    <thetext>BTW I&apos;m using the recently released 2.20.4</thetext>
  </long_desc><long_desc isprivate="0" >
    <commentid>1449284</commentid>
    <comment_count>2</comment_count>
    <who name="Michael Catanzaro">mcatanzaro</who>
    <bug_when>2018-08-10 09:19:39 -0700</bug_when>
    <thetext>If it&apos;s a regression from 2.20.3, then please mark this as a duplicate of bug #188377. Carlos Garcia will do a fixup release next week.</thetext>
  </long_desc><long_desc isprivate="0" >
    <commentid>1449286</commentid>
    <comment_count>3</comment_count>
    <who name="Sergio Villar Senin">svillar</who>
    <bug_when>2018-08-10 09:33:04 -0700</bug_when>
    <thetext>(In reply to Michael Catanzaro from comment #2)
&gt; If it&apos;s a regression from 2.20.3, then please mark this as a duplicate of
&gt; bug #188377. Carlos Garcia will do a fixup release next week.

I don&apos;t think it&apos;s a regression from 2.20.3 as I&apos;ve seen it for a while now, like 3-4 months at least. I&apos;ll wait for next release and close it if it&apos;s really caused by the same change that fixed the other bug.</thetext>
  </long_desc><long_desc isprivate="0" >
    <commentid>1449426</commentid>
    <comment_count>4</comment_count>
    <who name="Michael Catanzaro">mcatanzaro</who>
    <bug_when>2018-08-10 17:27:20 -0700</bug_when>
    <thetext>No, it&apos;s a separate issue, then.</thetext>
  </long_desc><long_desc isprivate="0" >
    <commentid>1449732</commentid>
    <comment_count>5</comment_count>
    <who name="Sergio Villar Senin">svillar</who>
    <bug_when>2018-08-13 12:51:55 -0700</bug_when>
    <thetext>It turned out that 2.20.5 fixed this too, so the root cause was the same. Working fine now.

*** This bug has been marked as a duplicate of bug 188377 ***</thetext>
  </long_desc>
      
      

    </bug>

</bugzilla>