<?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>208566</bug_id>
          
          <creation_ts>2020-03-04 00:53:55 -0800</creation_ts>
          <short_desc>REGRESSION(r255957): Element with scroll-behavior:smooth isn&apos;t draggable after r255957</short_desc>
          <delta_ts>2020-11-25 07:12:05 -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>Scrolling</component>
          <version>WebKit Nightly Build</version>
          <rep_platform>Unspecified</rep_platform>
          <op_sys>Unspecified</op_sys>
          <bug_status>RESOLVED</bug_status>
          <resolution>FIXED</resolution>
          
          <see_also>https://bugs.webkit.org/show_bug.cgi?id=42194</see_also>
          <bug_file_loc></bug_file_loc>
          <status_whiteboard></status_whiteboard>
          <keywords>InRadar</keywords>
          <priority>P2</priority>
          <bug_severity>Normal</bug_severity>
          <target_milestone>---</target_milestone>
          <dependson>219284</dependson>
          <blocked>204882</blocked>
          <everconfirmed>1</everconfirmed>
          <reporter name="cathiechen">cathiechen</reporter>
          <assigned_to name="cathiechen">cathiechen</assigned_to>
          <cc>commit-queue</cc>
    
    <cc>esprehn+autocc</cc>
    
    <cc>ews-watchlist</cc>
    
    <cc>fred.wang</cc>
    
    <cc>glenn</cc>
    
    <cc>kondapallykalyan</cc>
    
    <cc>pdr</cc>
    
    <cc>simon.fraser</cc>
    
    <cc>webkit-bug-importer</cc>
          

      

      

      

          <comment_sort_order>oldest_to_newest</comment_sort_order>  
          <long_desc isprivate="0" >
    <commentid>1625447</commentid>
    <comment_count>0</comment_count>
    <who name="cathiechen">cathiechen</who>
    <bug_when>2020-03-04 00:53:55 -0800</bug_when>
    <thetext>The autoscroll uses m_autoscrollTimer to perform drag scroll animation, then uses RenderLayer::scrollRectToVisible to perform scroll.
In this scenario RenderLayer::scrollRectToVisible shouldn&apos;t consider scroll-behavior and scroll immediately.</thetext>
  </long_desc><long_desc isprivate="0" >
    <commentid>1625461</commentid>
    <comment_count>1</comment_count>
      <attachid>392397</attachid>
    <who name="cathiechen">cathiechen</who>
    <bug_when>2020-03-04 02:17:00 -0800</bug_when>
    <thetext>Created attachment 392397
Patch</thetext>
  </long_desc><long_desc isprivate="0" >
    <commentid>1625463</commentid>
    <comment_count>2</comment_count>
      <attachid>392398</attachid>
    <who name="cathiechen">cathiechen</who>
    <bug_when>2020-03-04 02:24:06 -0800</bug_when>
    <thetext>Created attachment 392398
Patch</thetext>
  </long_desc><long_desc isprivate="0" >
    <commentid>1626533</commentid>
    <comment_count>3</comment_count>
      <attachid>392685</attachid>
    <who name="cathiechen">cathiechen</who>
    <bug_when>2020-03-05 23:24:05 -0800</bug_when>
    <thetext>Created attachment 392685
Patch</thetext>
  </long_desc><long_desc isprivate="0" >
    <commentid>1626534</commentid>
    <comment_count>4</comment_count>
    <who name="cathiechen">cathiechen</who>
    <bug_when>2020-03-05 23:29:38 -0800</bug_when>
    <thetext>About the test for this patch, we need to create a drag action.
I tried to use eventSender, but it doesn&apos;t work. Maybe we can add a manual test?</thetext>
  </long_desc><long_desc isprivate="0" >
    <commentid>1626535</commentid>
    <comment_count>5</comment_count>
      <attachid>392686</attachid>
    <who name="cathiechen">cathiechen</who>
    <bug_when>2020-03-05 23:34:14 -0800</bug_when>
    <thetext>Created attachment 392686
Patch</thetext>
  </long_desc><long_desc isprivate="0" >
    <commentid>1626597</commentid>
    <comment_count>6</comment_count>
      <attachid>392686</attachid>
    <who name="Frédéric Wang Nélar">fred.wang</who>
    <bug_when>2020-03-06 03:35:14 -0800</bug_when>
    <thetext>Comment on attachment 392686
Patch

View in context: https://bugs.webkit.org/attachment.cgi?id=392686&amp;action=review

LGTM, I wonder if we already have tests for this feature and whether we can adapt them for scroll behavior?

&gt; Source/WebCore/rendering/RenderLayer.cpp:2797
&gt; +void RenderLayer::scrollRectToVisible(const LayoutRect&amp; absoluteRect, bool insideFixed, const ScrollRectToVisibleOptions&amp; options, bool isAutoscrollInProgress)

I guess it should be AutoScrollInProgress?</thetext>
  </long_desc><long_desc isprivate="0" >
    <commentid>1626617</commentid>
    <comment_count>7</comment_count>
    <who name="cathiechen">cathiechen</who>
    <bug_when>2020-03-06 04:57:44 -0800</bug_when>
    <thetext>(In reply to Frédéric Wang (:fredw) from comment #6)
&gt; Comment on attachment 392686 [details]
&gt; Patch
&gt; 
&gt; View in context:
&gt; https://bugs.webkit.org/attachment.cgi?id=392686&amp;action=review
&gt; 
&gt; LGTM, I wonder if we already have tests for this feature and whether we can
&gt; adapt them for scroll behavior?
&gt; 

Good idea! I&apos;ll have a try!

&gt; &gt; Source/WebCore/rendering/RenderLayer.cpp:2797
&gt; &gt; +void RenderLayer::scrollRectToVisible(const LayoutRect&amp; absoluteRect, bool insideFixed, const ScrollRectToVisibleOptions&amp; options, bool isAutoscrollInProgress)
&gt; 
&gt; I guess it should be AutoScrollInProgress?

Done, changed it to autoscrollInProgress.</thetext>
  </long_desc><long_desc isprivate="0" >
    <commentid>1626621</commentid>
    <comment_count>8</comment_count>
      <attachid>392708</attachid>
    <who name="cathiechen">cathiechen</who>
    <bug_when>2020-03-06 05:02:26 -0800</bug_when>
    <thetext>Created attachment 392708
Patch</thetext>
  </long_desc><long_desc isprivate="0" >
    <commentid>1626626</commentid>
    <comment_count>9</comment_count>
      <attachid>392710</attachid>
    <who name="cathiechen">cathiechen</who>
    <bug_when>2020-03-06 05:28:17 -0800</bug_when>
    <thetext>Created attachment 392710
Patch</thetext>
  </long_desc><long_desc isprivate="0" >
    <commentid>1626699</commentid>
    <comment_count>10</comment_count>
      <attachid>392710</attachid>
    <who name="Simon Fraser (smfr)">simon.fraser</who>
    <bug_when>2020-03-06 09:22:18 -0800</bug_when>
    <thetext>Comment on attachment 392710
Patch

View in context: https://bugs.webkit.org/attachment.cgi?id=392710&amp;action=review

&gt; Source/WebCore/rendering/RenderLayer.cpp:2802
&gt; +    if (autoscrollInProgress)
&gt; +        ASSERT(false);

hmm?

&gt; Source/WebCore/rendering/RenderLayer.cpp:3040
&gt; +    scrollRectToVisible(LayoutRect(currentDocumentPosition, LayoutSize(1, 1)), false, { SelectionRevealMode::Reveal, ScrollAlignment::alignToEdgeIfNeeded, ScrollAlignment::alignToEdgeIfNeeded, ShouldAllowCrossOriginScrolling::Yes }, true);

Boolean trap</thetext>
  </long_desc><long_desc isprivate="0" >
    <commentid>1626720</commentid>
    <comment_count>11</comment_count>
      <attachid>392738</attachid>
    <who name="cathiechen">cathiechen</who>
    <bug_when>2020-03-06 10:00:52 -0800</bug_when>
    <thetext>Created attachment 392738
drag-smooth-scroll-element

Add test case.</thetext>
  </long_desc><long_desc isprivate="0" >
    <commentid>1626756</commentid>
    <comment_count>12</comment_count>
      <attachid>392710</attachid>
    <who name="cathiechen">cathiechen</who>
    <bug_when>2020-03-06 11:11:01 -0800</bug_when>
    <thetext>Comment on attachment 392710
Patch

View in context: https://bugs.webkit.org/attachment.cgi?id=392710&amp;action=review

Hi Simon,

Thanks for the review:)

&gt;&gt; Source/WebCore/rendering/RenderLayer.cpp:2802
&gt;&gt; +        ASSERT(false);
&gt; 
&gt; hmm?

Ah, sorry, this is used to find out the autoscroll tests. It&apos;ll remove in the new patch.

&gt;&gt; Source/WebCore/rendering/RenderLayer.cpp:3040
&gt;&gt; +    scrollRectToVisible(LayoutRect(currentDocumentPosition, LayoutSize(1, 1)), false, { SelectionRevealMode::Reveal, ScrollAlignment::alignToEdgeIfNeeded, ScrollAlignment::alignToEdgeIfNeeded, ShouldAllowCrossOriginScrolling::Yes }, true);
&gt; 
&gt; Boolean trap

Thanks, how about enum AutoscrollStatus { NotInProgress, InProgress } ?</thetext>
  </long_desc><long_desc isprivate="0" >
    <commentid>1626762</commentid>
    <comment_count>13</comment_count>
      <attachid>392747</attachid>
    <who name="cathiechen">cathiechen</who>
    <bug_when>2020-03-06 11:22:04 -0800</bug_when>
    <thetext>Created attachment 392747
Patch</thetext>
  </long_desc><long_desc isprivate="0" >
    <commentid>1628126</commentid>
    <comment_count>14</comment_count>
    <who name="cathiechen">cathiechen</who>
    <bug_when>2020-03-09 23:01:27 -0700</bug_when>
    <thetext>Hi Fred and Simon,

The new patch add a test using eventSender to simulate the drag action.
Please take a look, thanks:)</thetext>
  </long_desc><long_desc isprivate="0" >
    <commentid>1628128</commentid>
    <comment_count>15</comment_count>
      <attachid>393121</attachid>
    <who name="cathiechen">cathiechen</who>
    <bug_when>2020-03-09 23:13:22 -0700</bug_when>
    <thetext>Created attachment 393121
Patch</thetext>
  </long_desc><long_desc isprivate="0" >
    <commentid>1628167</commentid>
    <comment_count>16</comment_count>
      <attachid>393121</attachid>
    <who name="Frédéric Wang Nélar">fred.wang</who>
    <bug_when>2020-03-10 03:58:40 -0700</bug_when>
    <thetext>Comment on attachment 393121
Patch

This LGTM, but I think it would be better to have a test for WK2. Can&apos;t you use UIHelper (e.g. dragFromPointToPoint?). See how it is done for other tests in fast/scrolling.</thetext>
  </long_desc><long_desc isprivate="0" >
    <commentid>1628656</commentid>
    <comment_count>17</comment_count>
    <who name="cathiechen">cathiechen</who>
    <bug_when>2020-03-11 08:34:37 -0700</bug_when>
    <thetext>(In reply to Frédéric Wang (:fredw) from comment #16)
&gt; Comment on attachment 393121 [details]
&gt; Patch
&gt; 
&gt; This LGTM, but I think it would be better to have a test for WK2. Can&apos;t you
&gt; use UIHelper (e.g. dragFromPointToPoint?). See how it is done for other
&gt; tests in fast/scrolling.

Hi Fred,
Thanks for the review!

It seems UIScriptControllerMac::dragFromPointToPoint for WebKitTestRunner is not implemented yet. I found UIScriptControllerMac::activateAtPoint which is related to mouse event and has implemented, is also using eventSender.
I also looked into some examples of autoscroll tests, they are also using eventSender.
So I guess eventSender is the common way to trigger an autoscroll in test.

Bug:42194 is tracing the incomplete implementation for eventSender. So the test would cover WK2 if Bug:42194 fixed.

Sorry, it seems my comments in changeLogs is confusing. I&apos;ll reword them.</thetext>
  </long_desc><long_desc isprivate="0" >
    <commentid>1628684</commentid>
    <comment_count>18</comment_count>
      <attachid>393253</attachid>
    <who name="cathiechen">cathiechen</who>
    <bug_when>2020-03-11 09:39:34 -0700</bug_when>
    <thetext>Created attachment 393253
Patch</thetext>
  </long_desc><long_desc isprivate="0" >
    <commentid>1629194</commentid>
    <comment_count>19</comment_count>
      <attachid>393378</attachid>
    <who name="cathiechen">cathiechen</who>
    <bug_when>2020-03-12 08:34:23 -0700</bug_when>
    <thetext>Created attachment 393378
Patch</thetext>
  </long_desc><long_desc isprivate="0" >
    <commentid>1629497</commentid>
    <comment_count>20</comment_count>
      <attachid>393456</attachid>
    <who name="cathiechen">cathiechen</who>
    <bug_when>2020-03-12 21:44:07 -0700</bug_when>
    <thetext>Created attachment 393456
Patch</thetext>
  </long_desc><long_desc isprivate="0" >
    <commentid>1629502</commentid>
    <comment_count>21</comment_count>
      <attachid>393456</attachid>
    <who name="WebKit Commit Bot">commit-queue</who>
    <bug_when>2020-03-12 22:30:58 -0700</bug_when>
    <thetext>Comment on attachment 393456
Patch

Clearing flags on attachment: 393456

Committed r258382: &lt;https://trac.webkit.org/changeset/258382&gt;</thetext>
  </long_desc><long_desc isprivate="0" >
    <commentid>1629503</commentid>
    <comment_count>22</comment_count>
    <who name="WebKit Commit Bot">commit-queue</who>
    <bug_when>2020-03-12 22:31:00 -0700</bug_when>
    <thetext>All reviewed patches have been landed.  Closing bug.</thetext>
  </long_desc><long_desc isprivate="0" >
    <commentid>1629504</commentid>
    <comment_count>23</comment_count>
    <who name="Radar WebKit Bug Importer">webkit-bug-importer</who>
    <bug_when>2020-03-12 22:31:17 -0700</bug_when>
    <thetext>&lt;rdar://problem/60404576&gt;</thetext>
  </long_desc>
      
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            <attachid>392397</attachid>
            <date>2020-03-04 02:17:00 -0800</date>
            <delta_ts>2020-03-04 02:23:59 -0800</delta_ts>
            <desc>Patch</desc>
            <filename>bug-208566-20200304181659.patch</filename>
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            <attacher name="cathiechen">cathiechen</attacher>
            
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          </attachment>
          <attachment
              isobsolete="1"
              ispatch="1"
              isprivate="0"
          >
            <attachid>392398</attachid>
            <date>2020-03-04 02:24:06 -0800</date>
            <delta_ts>2020-03-05 23:23:58 -0800</delta_ts>
            <desc>Patch</desc>
            <filename>bug-208566-20200304182404.patch</filename>
            <type>text/plain</type>
            <size>6267</size>
            <attacher name="cathiechen">cathiechen</attacher>
            
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            <date>2020-03-05 23:24:05 -0800</date>
            <delta_ts>2020-03-05 23:34:08 -0800</delta_ts>
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            <type>text/plain</type>
            <size>6415</size>
            <attacher name="cathiechen">cathiechen</attacher>
            
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            <attachid>392686</attachid>
            <date>2020-03-05 23:34:14 -0800</date>
            <delta_ts>2020-03-06 05:02:11 -0800</delta_ts>
            <desc>Patch</desc>
            <filename>bug-208566-20200306153412.patch</filename>
            <type>text/plain</type>
            <size>6412</size>
            <attacher name="cathiechen">cathiechen</attacher>
            
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          </attachment>
          <attachment
              isobsolete="1"
              ispatch="1"
              isprivate="0"
          >
            <attachid>392708</attachid>
            <date>2020-03-06 05:02:26 -0800</date>
            <delta_ts>2020-03-06 05:28:08 -0800</delta_ts>
            <desc>Patch</desc>
            <filename>bug-208566-20200306210223.patch</filename>
            <type>text/plain</type>
            <size>6424</size>
            <attacher name="cathiechen">cathiechen</attacher>
            
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          </attachment>
          <attachment
              isobsolete="1"
              ispatch="1"
              isprivate="0"
          >
            <attachid>392710</attachid>
            <date>2020-03-06 05:28:17 -0800</date>
            <delta_ts>2020-03-06 11:21:56 -0800</delta_ts>
            <desc>Patch</desc>
            <filename>bug-208566-20200306212815.patch</filename>
            <type>text/plain</type>
            <size>6544</size>
            <attacher name="cathiechen">cathiechen</attacher>
            
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          </attachment>
          <attachment
              isobsolete="1"
              ispatch="1"
              isprivate="0"
          >
            <attachid>393121</attachid>
            <date>2020-03-09 23:13:22 -0700</date>
            <delta_ts>2020-03-11 09:39:28 -0700</delta_ts>
            <desc>Patch</desc>
            <filename>bug-208566-20200310141319.patch</filename>
            <type>text/plain</type>
            <size>12897</size>
            <attacher name="cathiechen">cathiechen</attacher>
            
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          </attachment>
          <attachment
              isobsolete="1"
              ispatch="1"
              isprivate="0"
          >
            <attachid>393253</attachid>
            <date>2020-03-11 09:39:34 -0700</date>
            <delta_ts>2020-03-12 08:34:15 -0700</delta_ts>
            <desc>Patch</desc>
            <filename>bug-208566-20200312003931.patch</filename>
            <type>text/plain</type>
            <size>13262</size>
            <attacher name="cathiechen">cathiechen</attacher>
            
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          </attachment>
          <attachment
              isobsolete="1"
              ispatch="1"
              isprivate="0"
          >
            <attachid>393378</attachid>
            <date>2020-03-12 08:34:23 -0700</date>
            <delta_ts>2020-03-12 21:43:43 -0700</delta_ts>
            <desc>Patch</desc>
            <filename>bug-208566-20200312233421.patch</filename>
            <type>text/plain</type>
            <size>11395</size>
            <attacher name="cathiechen">cathiechen</attacher>
            
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          </attachment>
          <attachment
              isobsolete="0"
              ispatch="1"
              isprivate="0"
          >
            <attachid>393456</attachid>
            <date>2020-03-12 21:44:07 -0700</date>
            <delta_ts>2020-03-12 22:30:58 -0700</delta_ts>
            <desc>Patch</desc>
            <filename>bug-208566-20200313124402.patch</filename>
            <type>text/plain</type>
            <size>11431</size>
            <attacher name="cathiechen">cathiechen</attacher>
            
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          </attachment>
      

    </bug>

</bugzilla>