Title: [238220] trunk
Revision
238220
Author
r...@igalia.com
Date
2018-11-15 04:19:24 -0800 (Thu, 15 Nov 2018)

Log Message

[css-grid] Consider scrollbars in populateGridPositionsForDirection()
https://bugs.webkit.org/show_bug.cgi?id=191656

Reviewed by Javier Fernandez.

LayoutTests/imported/w3c:

Imported tests from WPT.

* web-platform-tests/css/css-grid/grid-model/grid-container-scrollbar-001-expected.html: Added.
* web-platform-tests/css/css-grid/grid-model/grid-container-scrollbar-001.html: Added.
* web-platform-tests/css/css-grid/grid-model/grid-container-scrollbar-vertical-lr-001-expected.html: Added.
* web-platform-tests/css/css-grid/grid-model/grid-container-scrollbar-vertical-lr-001.html: Added.
* web-platform-tests/css/css-grid/grid-model/grid-container-scrollbar-vertical-rl-001-expected.html: Added.
* web-platform-tests/css/css-grid/grid-model/grid-container-scrollbar-vertical-rl-001.html: Added.
* web-platform-tests/css/css-grid/grid-model/w3c-import.log:

Source/WebCore:

We never care about scrollbars in RenderGrid::populateGridPositionsForDirection(),
that's fine if the scrollbars are at the end (e.g. on the right in horizontal writing mode and LTR direction)
but it causes problems when they're at the beginning (e.g. on the left in horizontal writing mode and RTL direction).

The patch modifies the method so it takes into account scrollbar size
in order to compute the position of the columns/rows depending on the direction and the writing mode.

Tests: imported/w3c/web-platform-tests/css/css-grid/grid-model/grid-container-scrollbar-001.html
       imported/w3c/web-platform-tests/css/css-grid/grid-model/grid-container-scrollbar-vertical-lr-001.html
       imported/w3c/web-platform-tests/css/css-grid/grid-model/grid-container-scrollbar-vertical-rl-001.html

* rendering/RenderGrid.cpp:
(WebCore::RenderGrid::populateGridPositionsForDirection):

Modified Paths

Added Paths

Diff

Modified: trunk/LayoutTests/imported/w3c/ChangeLog (238219 => 238220)


--- trunk/LayoutTests/imported/w3c/ChangeLog	2018-11-15 06:01:15 UTC (rev 238219)
+++ trunk/LayoutTests/imported/w3c/ChangeLog	2018-11-15 12:19:24 UTC (rev 238220)
@@ -1,3 +1,20 @@
+2018-11-15  Manuel Rego Casasnovas  <r...@igalia.com>
+
+        [css-grid] Consider scrollbars in populateGridPositionsForDirection()
+        https://bugs.webkit.org/show_bug.cgi?id=191656
+
+        Reviewed by Javier Fernandez.
+
+        Imported tests from WPT.
+
+        * web-platform-tests/css/css-grid/grid-model/grid-container-scrollbar-001-expected.html: Added.
+        * web-platform-tests/css/css-grid/grid-model/grid-container-scrollbar-001.html: Added.
+        * web-platform-tests/css/css-grid/grid-model/grid-container-scrollbar-vertical-lr-001-expected.html: Added.
+        * web-platform-tests/css/css-grid/grid-model/grid-container-scrollbar-vertical-lr-001.html: Added.
+        * web-platform-tests/css/css-grid/grid-model/grid-container-scrollbar-vertical-rl-001-expected.html: Added.
+        * web-platform-tests/css/css-grid/grid-model/grid-container-scrollbar-vertical-rl-001.html: Added.
+        * web-platform-tests/css/css-grid/grid-model/w3c-import.log:
+
 2018-11-14  Youenn Fablet  <you...@apple.com>
 
         Convert libwebrtc error types to DOM exceptions

Added: trunk/LayoutTests/imported/w3c/web-platform-tests/css/css-grid/grid-model/grid-container-scrollbar-001-expected.html (0 => 238220)


--- trunk/LayoutTests/imported/w3c/web-platform-tests/css/css-grid/grid-model/grid-container-scrollbar-001-expected.html	                        (rev 0)
+++ trunk/LayoutTests/imported/w3c/web-platform-tests/css/css-grid/grid-model/grid-container-scrollbar-001-expected.html	2018-11-15 12:19:24 UTC (rev 238220)
@@ -0,0 +1,95 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>CSS container Layout Test Reference</title>
+<link rel="author" title="Manuel Rego Casasnovas" href=""
+<style>
+  .container {
+    margin: 10px;
+    background: grey;
+  }
+
+  .scrollX {
+    overflow-x: scroll;
+  }
+
+  .scrollY {
+    overflow-y: scroll;
+  }
+
+  .fixedSize {
+    width: 200px;
+    height: 50px;
+  }
+
+  .container > div {
+    background: cyan;
+    width: 100%;
+    height: 100%;
+  }
+
+  .directionRTL {
+    direction: rtl;
+  }
+</style>
+
+<p>The test passes if it has the same output than the reference.</p>
+
+<div style="float: left; width: 350px;">
+
+  <h2>direction: ltr;</h2>
+
+  <div class="container scrollX">
+    <div>item</div>
+  </div>
+
+  <div class="container scrollY">
+    <div>item</div>
+  </div>
+
+  <div class="container scrollX scrollY">
+    <div>item</div>
+  </div>
+
+  <div class="container fixedSize scrollX">
+    <div>item</div>
+  </div>
+
+  <div class="container fixedSize scrollY">
+    <div>item</div>
+  </div>
+
+  <div class="container fixedSize scrollX scrollY">
+    <div>item</div>
+  </div>
+
+</div>
+
+<div style="float: left; width: 350px;">
+
+  <h2>direction: rtl;</h2>
+
+  <div class="directionRTL container scrollX">
+    <div>item</div>
+  </div>
+
+  <div class="directionRTL container scrollY">
+    <div>item</div>
+  </div>
+
+  <div class="directionRTL container scrollX scrollY">
+    <div>item</div>
+  </div>
+
+  <div class="directionRTL container fixedSize scrollX">
+    <div>item</div>
+  </div>
+
+  <div class="directionRTL container fixedSize scrollY">
+    <div>item</div>
+  </div>
+
+  <div class="directionRTL container fixedSize scrollX scrollY">
+    <div>item</div>
+  </div>
+
+</div>

Added: trunk/LayoutTests/imported/w3c/web-platform-tests/css/css-grid/grid-model/grid-container-scrollbar-001.html (0 => 238220)


--- trunk/LayoutTests/imported/w3c/web-platform-tests/css/css-grid/grid-model/grid-container-scrollbar-001.html	                        (rev 0)
+++ trunk/LayoutTests/imported/w3c/web-platform-tests/css/css-grid/grid-model/grid-container-scrollbar-001.html	2018-11-15 12:19:24 UTC (rev 238220)
@@ -0,0 +1,92 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>CSS Grid Layout Test: Grid container with scrollbars</title>
+<link rel="author" title="Manuel Rego Casasnovas" href=""
+<link rel="help" href=""
+<link rel="match" href=""
+<meta name="assert" content="This test verifes that scrollbars are properly painted on grid containers, and are shown in the expected position depending on the direction.">
+<link href="" rel="stylesheet">
+<style>
+  .grid {
+    margin: 10px;
+  }
+
+  .scrollX {
+    overflow-x: scroll;
+  }
+
+  .scrollY {
+    overflow-y: scroll;
+  }
+
+  .fixedSize {
+    width: 200px;
+    height: 50px;
+  }
+
+  .grid > div {
+    background: cyan;
+  }
+</style>
+
+<p>The test passes if it has the same output than the reference.</p>
+
+<div style="float: left; width: 350px;">
+
+  <h2>direction: ltr;</h2>
+
+  <div class="grid scrollX">
+    <div>item</div>
+  </div>
+
+  <div class="grid scrollY">
+    <div>item</div>
+  </div>
+
+  <div class="grid scrollX scrollY">
+    <div>item</div>
+  </div>
+
+  <div class="grid fixedSize scrollX">
+    <div>item</div>
+  </div>
+
+  <div class="grid fixedSize scrollY">
+    <div>item</div>
+  </div>
+
+  <div class="grid fixedSize scrollX scrollY">
+    <div>item</div>
+  </div>
+
+</div>
+
+<div style="float: left; width: 350px;">
+
+  <h2>direction: rtl;</h2>
+
+  <div class="directionRTL grid scrollX">
+    <div>item</div>
+  </div>
+
+  <div class="directionRTL grid scrollY">
+    <div>item</div>
+  </div>
+
+  <div class="directionRTL grid scrollX scrollY">
+    <div>item</div>
+  </div>
+
+  <div class="directionRTL grid fixedSize scrollX">
+    <div>item</div>
+  </div>
+
+  <div class="directionRTL grid fixedSize scrollY">
+    <div>item</div>
+  </div>
+
+  <div class="directionRTL grid fixedSize scrollX scrollY">
+    <div>item</div>
+  </div>
+
+</div>

Added: trunk/LayoutTests/imported/w3c/web-platform-tests/css/css-grid/grid-model/grid-container-scrollbar-vertical-lr-001-expected.html (0 => 238220)


--- trunk/LayoutTests/imported/w3c/web-platform-tests/css/css-grid/grid-model/grid-container-scrollbar-vertical-lr-001-expected.html	                        (rev 0)
+++ trunk/LayoutTests/imported/w3c/web-platform-tests/css/css-grid/grid-model/grid-container-scrollbar-vertical-lr-001-expected.html	2018-11-15 12:19:24 UTC (rev 238220)
@@ -0,0 +1,96 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>CSS container Layout Test Reference</title>
+<link rel="author" title="Manuel Rego Casasnovas" href=""
+<style>
+  .container {
+    margin: 10px;
+    background: grey;
+    writing-mode: vertical-lr;
+  }
+
+  .scrollX {
+    overflow-x: scroll;
+  }
+
+  .scrollY {
+    overflow-y: scroll;
+  }
+
+  .fixedSize {
+    width: 200px;
+    height: 50px;
+  }
+
+  .container > div {
+    background: cyan;
+    width: 100%;
+    height: 100%;
+  }
+
+  .directionRTL {
+    direction: rtl;
+  }
+</style>
+
+<p>The test passes if it has the same output than the reference.</p>
+
+<div style="float: left; width: 350px;">
+
+  <h2>direction: ltr;</h2>
+
+  <div class="container scrollX">
+    <div>item</div>
+  </div>
+
+  <div class="container scrollY">
+    <div>item</div>
+  </div>
+
+  <div class="container scrollX scrollY">
+    <div>item</div>
+  </div>
+
+  <div class="container fixedSize scrollX">
+    <div>item</div>
+  </div>
+
+  <div class="container fixedSize scrollY">
+    <div>item</div>
+  </div>
+
+  <div class="container fixedSize scrollX scrollY">
+    <div>item</div>
+  </div>
+
+</div>
+
+<div style="float: left; width: 350px;">
+
+  <h2>direction: rtl;</h2>
+
+  <div class="directionRTL container scrollX">
+    <div>item</div>
+  </div>
+
+  <div class="directionRTL container scrollY">
+    <div>item</div>
+  </div>
+
+  <div class="directionRTL container scrollX scrollY">
+    <div>item</div>
+  </div>
+
+  <div class="directionRTL container fixedSize scrollX">
+    <div>item</div>
+  </div>
+
+  <div class="directionRTL container fixedSize scrollY">
+    <div>item</div>
+  </div>
+
+  <div class="directionRTL container fixedSize scrollX scrollY">
+    <div>item</div>
+  </div>
+
+</div>

Added: trunk/LayoutTests/imported/w3c/web-platform-tests/css/css-grid/grid-model/grid-container-scrollbar-vertical-lr-001.html (0 => 238220)


--- trunk/LayoutTests/imported/w3c/web-platform-tests/css/css-grid/grid-model/grid-container-scrollbar-vertical-lr-001.html	                        (rev 0)
+++ trunk/LayoutTests/imported/w3c/web-platform-tests/css/css-grid/grid-model/grid-container-scrollbar-vertical-lr-001.html	2018-11-15 12:19:24 UTC (rev 238220)
@@ -0,0 +1,93 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>CSS Grid Layout Test: Grid container with scrollbars</title>
+<link rel="author" title="Manuel Rego Casasnovas" href=""
+<link rel="help" href=""
+<link rel="match" href=""
+<meta name="assert" content="This test verifes that scrollbars are properly painted on grid containers, and are shown in the expected position depending on the direction.">
+<link href="" rel="stylesheet">
+<style>
+  .grid {
+    margin: 10px;
+    writing-mode: vertical-lr;
+  }
+
+  .scrollX {
+    overflow-x: scroll;
+  }
+
+  .scrollY {
+    overflow-y: scroll;
+  }
+
+  .fixedSize {
+    width: 200px;
+    height: 50px;
+  }
+
+  .grid > div {
+    background: cyan;
+  }
+</style>
+
+<p>The test passes if it has the same output than the reference.</p>
+
+<div style="float: left; width: 350px;">
+
+  <h2>direction: ltr;</h2>
+
+  <div class="grid scrollX">
+    <div>item</div>
+  </div>
+
+  <div class="grid scrollY">
+    <div>item</div>
+  </div>
+
+  <div class="grid scrollX scrollY">
+    <div>item</div>
+  </div>
+
+  <div class="grid fixedSize scrollX">
+    <div>item</div>
+  </div>
+
+  <div class="grid fixedSize scrollY">
+    <div>item</div>
+  </div>
+
+  <div class="grid fixedSize scrollX scrollY">
+    <div>item</div>
+  </div>
+
+</div>
+
+<div style="float: left; width: 350px;">
+
+  <h2>direction: rtl;</h2>
+
+  <div class="directionRTL grid scrollX">
+    <div>item</div>
+  </div>
+
+  <div class="directionRTL grid scrollY">
+    <div>item</div>
+  </div>
+
+  <div class="directionRTL grid scrollX scrollY">
+    <div>item</div>
+  </div>
+
+  <div class="directionRTL grid fixedSize scrollX">
+    <div>item</div>
+  </div>
+
+  <div class="directionRTL grid fixedSize scrollY">
+    <div>item</div>
+  </div>
+
+  <div class="directionRTL grid fixedSize scrollX scrollY">
+    <div>item</div>
+  </div>
+
+</div>

Added: trunk/LayoutTests/imported/w3c/web-platform-tests/css/css-grid/grid-model/grid-container-scrollbar-vertical-rl-001-expected.html (0 => 238220)


--- trunk/LayoutTests/imported/w3c/web-platform-tests/css/css-grid/grid-model/grid-container-scrollbar-vertical-rl-001-expected.html	                        (rev 0)
+++ trunk/LayoutTests/imported/w3c/web-platform-tests/css/css-grid/grid-model/grid-container-scrollbar-vertical-rl-001-expected.html	2018-11-15 12:19:24 UTC (rev 238220)
@@ -0,0 +1,96 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>CSS container Layout Test Reference</title>
+<link rel="author" title="Manuel Rego Casasnovas" href=""
+<style>
+  .container {
+    margin: 10px;
+    background: grey;
+    writing-mode: vertical-rl;
+  }
+
+  .scrollX {
+    overflow-x: scroll;
+  }
+
+  .scrollY {
+    overflow-y: scroll;
+  }
+
+  .fixedSize {
+    width: 200px;
+    height: 50px;
+  }
+
+  .container > div {
+    background: cyan;
+    width: 100%;
+    height: 100%;
+  }
+
+  .directionRTL {
+    direction: rtl;
+  }
+</style>
+
+<p>The test passes if it has the same output than the reference.</p>
+
+<div style="float: left; width: 350px;">
+
+  <h2>direction: ltr;</h2>
+
+  <div class="container scrollX">
+    <div>item</div>
+  </div>
+
+  <div class="container scrollY">
+    <div>item</div>
+  </div>
+
+  <div class="container scrollX scrollY">
+    <div>item</div>
+  </div>
+
+  <div class="container fixedSize scrollX">
+    <div>item</div>
+  </div>
+
+  <div class="container fixedSize scrollY">
+    <div>item</div>
+  </div>
+
+  <div class="container fixedSize scrollX scrollY">
+    <div>item</div>
+  </div>
+
+</div>
+
+<div style="float: left; width: 350px;">
+
+  <h2>direction: rtl;</h2>
+
+  <div class="directionRTL container scrollX">
+    <div>item</div>
+  </div>
+
+  <div class="directionRTL container scrollY">
+    <div>item</div>
+  </div>
+
+  <div class="directionRTL container scrollX scrollY">
+    <div>item</div>
+  </div>
+
+  <div class="directionRTL container fixedSize scrollX">
+    <div>item</div>
+  </div>
+
+  <div class="directionRTL container fixedSize scrollY">
+    <div>item</div>
+  </div>
+
+  <div class="directionRTL container fixedSize scrollX scrollY">
+    <div>item</div>
+  </div>
+
+</div>

Added: trunk/LayoutTests/imported/w3c/web-platform-tests/css/css-grid/grid-model/grid-container-scrollbar-vertical-rl-001.html (0 => 238220)


--- trunk/LayoutTests/imported/w3c/web-platform-tests/css/css-grid/grid-model/grid-container-scrollbar-vertical-rl-001.html	                        (rev 0)
+++ trunk/LayoutTests/imported/w3c/web-platform-tests/css/css-grid/grid-model/grid-container-scrollbar-vertical-rl-001.html	2018-11-15 12:19:24 UTC (rev 238220)
@@ -0,0 +1,93 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>CSS Grid Layout Test: Grid container with scrollbars</title>
+<link rel="author" title="Manuel Rego Casasnovas" href=""
+<link rel="help" href=""
+<link rel="match" href=""
+<meta name="assert" content="This test verifes that scrollbars are properly painted on grid containers, and are shown in the expected position depending on the direction.">
+<link href="" rel="stylesheet">
+<style>
+  .grid {
+    margin: 10px;
+    writing-mode: vertical-rl;
+  }
+
+  .scrollX {
+    overflow-x: scroll;
+  }
+
+  .scrollY {
+    overflow-y: scroll;
+  }
+
+  .fixedSize {
+    width: 200px;
+    height: 50px;
+  }
+
+  .grid > div {
+    background: cyan;
+  }
+</style>
+
+<p>The test passes if it has the same output than the reference.</p>
+
+<div style="float: left; width: 350px;">
+
+  <h2>direction: ltr;</h2>
+
+  <div class="grid scrollX">
+    <div>item</div>
+  </div>
+
+  <div class="grid scrollY">
+    <div>item</div>
+  </div>
+
+  <div class="grid scrollX scrollY">
+    <div>item</div>
+  </div>
+
+  <div class="grid fixedSize scrollX">
+    <div>item</div>
+  </div>
+
+  <div class="grid fixedSize scrollY">
+    <div>item</div>
+  </div>
+
+  <div class="grid fixedSize scrollX scrollY">
+    <div>item</div>
+  </div>
+
+</div>
+
+<div style="float: left; width: 350px;">
+
+  <h2>direction: rtl;</h2>
+
+  <div class="directionRTL grid scrollX">
+    <div>item</div>
+  </div>
+
+  <div class="directionRTL grid scrollY">
+    <div>item</div>
+  </div>
+
+  <div class="directionRTL grid scrollX scrollY">
+    <div>item</div>
+  </div>
+
+  <div class="directionRTL grid fixedSize scrollX">
+    <div>item</div>
+  </div>
+
+  <div class="directionRTL grid fixedSize scrollY">
+    <div>item</div>
+  </div>
+
+  <div class="directionRTL grid fixedSize scrollX scrollY">
+    <div>item</div>
+  </div>
+
+</div>

Modified: trunk/LayoutTests/imported/w3c/web-platform-tests/css/css-grid/grid-model/w3c-import.log (238219 => 238220)


--- trunk/LayoutTests/imported/w3c/web-platform-tests/css/css-grid/grid-model/w3c-import.log	2018-11-15 06:01:15 UTC (rev 238219)
+++ trunk/LayoutTests/imported/w3c/web-platform-tests/css/css-grid/grid-model/w3c-import.log	2018-11-15 12:19:24 UTC (rev 238220)
@@ -24,6 +24,12 @@
 /LayoutTests/imported/w3c/web-platform-tests/css/css-grid/grid-model/grid-container-ignores-first-letter-002-expected.html
 /LayoutTests/imported/w3c/web-platform-tests/css/css-grid/grid-model/grid-container-ignores-first-letter-002.html
 /LayoutTests/imported/w3c/web-platform-tests/css/css-grid/grid-model/grid-container-ignores-first-line-001.html
+/LayoutTests/imported/w3c/web-platform-tests/css/css-grid/grid-model/grid-container-scrollbar-001-expected.html
+/LayoutTests/imported/w3c/web-platform-tests/css/css-grid/grid-model/grid-container-scrollbar-001.html
+/LayoutTests/imported/w3c/web-platform-tests/css/css-grid/grid-model/grid-container-scrollbar-vertical-lr-001-expected.html
+/LayoutTests/imported/w3c/web-platform-tests/css/css-grid/grid-model/grid-container-scrollbar-vertical-lr-001.html
+/LayoutTests/imported/w3c/web-platform-tests/css/css-grid/grid-model/grid-container-scrollbar-vertical-rl-001-expected.html
+/LayoutTests/imported/w3c/web-platform-tests/css/css-grid/grid-model/grid-container-scrollbar-vertical-rl-001.html
 /LayoutTests/imported/w3c/web-platform-tests/css/css-grid/grid-model/grid-display-grid-001-expected.xht
 /LayoutTests/imported/w3c/web-platform-tests/css/css-grid/grid-model/grid-display-grid-001.html
 /LayoutTests/imported/w3c/web-platform-tests/css/css-grid/grid-model/grid-display-inline-grid-001-expected.xht

Modified: trunk/Source/WebCore/ChangeLog (238219 => 238220)


--- trunk/Source/WebCore/ChangeLog	2018-11-15 06:01:15 UTC (rev 238219)
+++ trunk/Source/WebCore/ChangeLog	2018-11-15 12:19:24 UTC (rev 238220)
@@ -1,3 +1,24 @@
+2018-11-15  Manuel Rego Casasnovas  <r...@igalia.com>
+
+        [css-grid] Consider scrollbars in populateGridPositionsForDirection()
+        https://bugs.webkit.org/show_bug.cgi?id=191656
+
+        Reviewed by Javier Fernandez.
+
+        We never care about scrollbars in RenderGrid::populateGridPositionsForDirection(),
+        that's fine if the scrollbars are at the end (e.g. on the right in horizontal writing mode and LTR direction)
+        but it causes problems when they're at the beginning (e.g. on the left in horizontal writing mode and RTL direction).
+
+        The patch modifies the method so it takes into account scrollbar size
+        in order to compute the position of the columns/rows depending on the direction and the writing mode.
+
+        Tests: imported/w3c/web-platform-tests/css/css-grid/grid-model/grid-container-scrollbar-001.html
+               imported/w3c/web-platform-tests/css/css-grid/grid-model/grid-container-scrollbar-vertical-lr-001.html
+               imported/w3c/web-platform-tests/css/css-grid/grid-model/grid-container-scrollbar-vertical-rl-001.html
+
+        * rendering/RenderGrid.cpp:
+        (WebCore::RenderGrid::populateGridPositionsForDirection):
+
 2018-11-14  Keith Rollin  <krol...@apple.com>
 
         Move scripts for Derived and Unified Sources to external files

Modified: trunk/Source/WebCore/rendering/RenderGrid.cpp (238219 => 238220)


--- trunk/Source/WebCore/rendering/RenderGrid.cpp	2018-11-15 06:01:15 UTC (rev 238219)
+++ trunk/Source/WebCore/rendering/RenderGrid.cpp	2018-11-15 12:19:24 UTC (rev 238220)
@@ -1003,7 +1003,13 @@
     const auto& offset = direction == ForColumns ? m_offsetBetweenColumns : m_offsetBetweenRows;
     auto& positions = isRowAxis ? m_columnPositions : m_rowPositions;
     positions.resize(numberOfLines);
+
     auto borderAndPadding = isRowAxis ? borderAndPaddingLogicalLeft() : borderAndPaddingBefore();
+    // If we are in horizontal writing mode and RTL direction the scrollbar is painted on the left,
+    // so we need to take into account when computing the position of the columns.
+    if (isRowAxis && style().isHorizontalWritingMode() && !style().isLeftToRightDirection())
+        borderAndPadding += scrollbarLogicalWidth();
+
     positions[0] = borderAndPadding + offset.positionOffset;
     if (numberOfLines > 1) {
         // If we have collapsed tracks we just ignore gaps here and add them later as we might not
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