Simple line layout: Add <br> support.

https://bugs.webkit.org/show_bug.cgi?id=139012

This patch enables RenderBlockFlows to use simple line layout on text content when <br> is present.
Simple text with <br> is a fairly common pattern on discussion(forum)-like web pages. This patch reduces memory usage
and speeds up layout for such content.

Source/WebCore:

PerformanceTest/layout/line-layout-simple.html shows more than 2x speedup, when each paragraph is modified by appending <br> to the end.
With <br> support enabled:
  mean: 70.02391461289068 runs/s
  median: 70.47986488932318 runs/s

While with <br> support disabled:
  mean: 30.417295049468184 runs/s
  median: 30.36517778760357 runs/s

Reviewed by Antti Koivisto.

Test: fast/text/simple-line-with-br.html

* editing/TextIterator.cpp:
(WebCore::TextIterator::handleTextNode):
* rendering/RenderBlock.h:
* rendering/RenderBlockFlow.cpp:
(WebCore::RenderBlockFlow::setSelectionState):
(WebCore::RenderBlockFlow::deleteLineBoxesBeforeSimpleLineLayout):
* rendering/RenderBlockFlow.h:
* rendering/RenderLineBreak.cpp:
(WebCore::simpleLineLayout):
(WebCore::ensureLineBoxes):
(WebCore::RenderLineBreak::deleteLineBoxesBeforeSimpleLineLayout):
(WebCore::RenderLineBreak::positionForPoint):
(WebCore::RenderLineBreak::setSelectionState):
(WebCore::RenderLineBreak::linesBoundingBox):
(WebCore::RenderLineBreak::absoluteRects):
(WebCore::RenderLineBreak::absoluteQuads):
(WebCore::RenderLineBreak::collectSelectionRects):
* rendering/RenderLineBreak.h:
* rendering/RenderText.cpp:
(WebCore::RenderText::absoluteRects):
(WebCore::RenderText::absoluteQuadsClippedToEllipsis):
(WebCore::RenderText::absoluteQuads):
(WebCore::RenderText::linesBoundingBox):
(WebCore::RenderText::caretMinOffset):
(WebCore::RenderText::caretMaxOffset):
(WebCore::RenderText::containsCaretOffset):
(WebCore::RenderText::hasRenderedText):
* rendering/SimpleLineLayout.cpp:
(WebCore::SimpleLineLayout::canUseFor):
(WebCore::SimpleLineLayout::LineState::removeTrailingWhitespace):
(WebCore::SimpleLineLayout::removeTrailingWhitespace):
(WebCore::SimpleLineLayout::consumeLineBreakIfNeeded):
(WebCore::SimpleLineLayout::skipWhitespaceIfNeeded):
(WebCore::SimpleLineLayout::firstFragment):
(WebCore::SimpleLineLayout::forceFragmentToLine):
(WebCore::SimpleLineLayout::createLineRuns):
(WebCore::SimpleLineLayout::create):
* rendering/SimpleLineLayoutFlowContents.cpp:
(WebCore::SimpleLineLayout::initializeSegments):
(WebCore::SimpleLineLayout::FlowContents::segmentForRenderer): Deleted.
* rendering/SimpleLineLayoutFlowContents.h:
* rendering/SimpleLineLayoutFunctions.cpp:
(WebCore::SimpleLineLayout::paintFlow):
(WebCore::SimpleLineLayout::hitTestFlow):
(WebCore::SimpleLineLayout::showLineLayoutForFlow):
* rendering/SimpleLineLayoutResolver.cpp:
(WebCore::SimpleLineLayout::RunResolver::Run::rect):
(WebCore::SimpleLineLayout::RunResolver::RunResolver):
(WebCore::SimpleLineLayout::RunResolver::rangeForRenderer):
* rendering/SimpleLineLayoutResolver.h:
(WebCore::SimpleLineLayout::RunResolver::Iterator::inQuirksMode):
(WebCore::SimpleLineLayout::RunResolver::Iterator::operator--):
* rendering/SimpleLineLayoutTextFragmentIterator.cpp:
(WebCore::SimpleLineLayout::TextFragmentIterator::nextTextFragment):
(WebCore::SimpleLineLayout::TextFragmentIterator::findNextTextFragment):
(WebCore::SimpleLineLayout::TextFragmentIterator::revertToFragment):
(WebCore::SimpleLineLayout::TextFragmentIterator::skipToNextPosition):
* rendering/SimpleLineLayoutTextFragmentIterator.h:
(WebCore::SimpleLineLayout::TextFragmentIterator::TextFragment::isLastInRenderer):
(WebCore::SimpleLineLayout::TextFragmentIterator::TextFragment::isLineBreak):
(WebCore::SimpleLineLayout::TextFragmentIterator::TextFragment::isEmpty):
(WebCore::SimpleLineLayout::TextFragmentIterator::isSoftLineBreak):
(WebCore::SimpleLineLayout::TextFragmentIterator::isHardLineBreak):
(WebCore::SimpleLineLayout::TextFragmentIterator::isLineBreak): Deleted.

LayoutTests:

Test output changes in 2 different ways:
1. Repositioned RenderLineBreak elements. (1px wide <br> is the result of integral pixel snapping)
2. Removed empty content (<br>).

Reviewed by Antti Koivisto.

* fast/text/simple-line-with-br-expected.html: Added.
* fast/text/simple-line-with-br.html: Added.
* platform/mac-mavericks/fast/parser/open-comment-in-textarea-expected.txt:
* platform/mac-mavericks/http/tests/navigation/javascriptlink-frames-expected.txt:
* platform/mac/editing/pasteboard/5761530-1-expected.txt: Added.
* platform/mac/fast/css/text-overflow-ellipsis-bidi-expected.txt:
* platform/mac/fast/dom/focus-contenteditable-expected.txt:
* platform/mac/fast/forms/range/slider-padding-expected.txt: Added.
* platform/mac/fast/forms/textarea-scroll-height-expected.txt:
* platform/mac/fast/parser/open-comment-in-textarea-expected.txt:
* platform/mac/fast/text/international/bidi-layout-across-linebreak-expected.txt:
* platform/mac/fast/text/svg-font-face-with-kerning-expected.txt: Added.
* platform/mac/http/tests/navigation/javascriptlink-frames-expected.txt:
* platform/mac/http/tests/navigation/postredirect-basic-expected.txt:
* platform/mac/http/tests/navigation/postredirect-goback1-expected.txt:
* platform/mac/printing/single-line-must-not-be-split-into-two-pages-expected.txt:
* platform/mac/svg/wicd/test-rightsizing-b-expected.txt:
* platform/mac/tables/mozilla/bugs/bug106795-expected.txt:
* platform/mac/tables/mozilla/bugs/bug1224-expected.txt:
* platform/mac/tables/mozilla/bugs/bug131020-expected.txt:
* platform/mac/tables/mozilla/bugs/bug131020_iframe-expected.txt:
* platform/mac/tables/mozilla/bugs/bug1430-expected.txt:
* platform/mac/tables/mozilla/bugs/bug16252-expected.txt:
* platform/mac/tables/mozilla/bugs/bug19599-expected.txt:
* platform/mac/tables/mozilla/bugs/bug20579-expected.txt:
* platform/mac/tables/mozilla/bugs/bug32205-3-expected.txt:
* platform/mac/tables/mozilla/bugs/bug82946-2-expected.txt:
* platform/mac/tables/mozilla/bugs/bug92143-expected.txt:
* platform/mac/tables/mozilla/marvin/tables_cellpadding-expected.txt:
* platform/mac/tables/mozilla/marvin/tables_cellspacing-expected.txt:
* platform/mac/tables/mozilla/other/wa_table_thtd_rowspan-expected.txt:
* platform/mac/tables/mozilla_expected_failures/bugs/bug1262-expected.txt:
* platform/mac/tables/mozilla_expected_failures/bugs/bug56024-expected.txt:
* platform/mac/tables/mozilla_expected_failures/other/test4-expected.txt:


Canonical link: https://commits.webkit.org/161618@main
git-svn-id: https://svn.webkit.org/repository/webkit/trunk@182620 268f45cc-cd09-0410-ab3c-d52691b4dbfc

LayoutTests/ChangeLog

@@ -1,3 +1,53 @@
+2015-04-09  Zalan Bujtas  <zalan@apple.com>
+
+        Simple line layout: Add <br> support.
+        https://bugs.webkit.org/show_bug.cgi?id=139012
+
+        This patch enables RenderBlockFlows to use simple line layout on text content when <br> is present.
+        Simple text with <br> is a fairly common pattern on discussion(forum)-like web pages. This patch reduces memory usage
+        and speeds up layout for such content.
+
+        Test output changes in 2 different ways:
+        1. Repositioned RenderLineBreak elements. (1px wide <br> is the result of integral pixel snapping)
+        2. Removed empty content (<br>).
+
+        Reviewed by Antti Koivisto.
+
+        * fast/text/simple-line-with-br-expected.html: Added.
+        * fast/text/simple-line-with-br.html: Added.
+        * platform/mac-mavericks/fast/parser/open-comment-in-textarea-expected.txt:
+        * platform/mac-mavericks/http/tests/navigation/javascriptlink-frames-expected.txt:
+        * platform/mac/editing/pasteboard/5761530-1-expected.txt: Added.
+        * platform/mac/fast/css/text-overflow-ellipsis-bidi-expected.txt:
+        * platform/mac/fast/dom/focus-contenteditable-expected.txt:
+        * platform/mac/fast/forms/range/slider-padding-expected.txt: Added.
+        * platform/mac/fast/forms/textarea-scroll-height-expected.txt:
+        * platform/mac/fast/parser/open-comment-in-textarea-expected.txt:
+        * platform/mac/fast/text/international/bidi-layout-across-linebreak-expected.txt:
+        * platform/mac/fast/text/svg-font-face-with-kerning-expected.txt: Added.
+        * platform/mac/http/tests/navigation/javascriptlink-frames-expected.txt:
+        * platform/mac/http/tests/navigation/postredirect-basic-expected.txt:
+        * platform/mac/http/tests/navigation/postredirect-goback1-expected.txt:
+        * platform/mac/printing/single-line-must-not-be-split-into-two-pages-expected.txt:
+        * platform/mac/svg/wicd/test-rightsizing-b-expected.txt:
+        * platform/mac/tables/mozilla/bugs/bug106795-expected.txt:
+        * platform/mac/tables/mozilla/bugs/bug1224-expected.txt:
+        * platform/mac/tables/mozilla/bugs/bug131020-expected.txt:
+        * platform/mac/tables/mozilla/bugs/bug131020_iframe-expected.txt:
+        * platform/mac/tables/mozilla/bugs/bug1430-expected.txt:
+        * platform/mac/tables/mozilla/bugs/bug16252-expected.txt:
+        * platform/mac/tables/mozilla/bugs/bug19599-expected.txt:
+        * platform/mac/tables/mozilla/bugs/bug20579-expected.txt:
+        * platform/mac/tables/mozilla/bugs/bug32205-3-expected.txt:
+        * platform/mac/tables/mozilla/bugs/bug82946-2-expected.txt:
+        * platform/mac/tables/mozilla/bugs/bug92143-expected.txt:
+        * platform/mac/tables/mozilla/marvin/tables_cellpadding-expected.txt:
+        * platform/mac/tables/mozilla/marvin/tables_cellspacing-expected.txt:
+        * platform/mac/tables/mozilla/other/wa_table_thtd_rowspan-expected.txt:
+        * platform/mac/tables/mozilla_expected_failures/bugs/bug1262-expected.txt:
+        * platform/mac/tables/mozilla_expected_failures/bugs/bug56024-expected.txt:
+        * platform/mac/tables/mozilla_expected_failures/other/test4-expected.txt:
+
 2015-04-09  Matthew Mirman  <mmirman@apple.com>
 
         Updated expectations on a few tests to account for error

LayoutTests/fast/text/simple-line-with-br-expected.html

@@ -0,0 +1,40 @@
+<!DOCTYPE html>
+<html>
+<head>
+<title>Test that text content with <br> works fine with simple line layout.</title>
+</head>
+<body>
+<script>
+function injectTextNodes(container, style)
+{
+	container.appendChild(document.createElement("br"));
+	container.appendChild(document.createElement("br"));
+	container.appendChild(document.createTextNode("	"));
+	container.appendChild(document.createElement("br"));
+	container.appendChild(document.createTextNode("This tests"));
+	container.appendChild(document.createTextNode(" 	   "));
+	container.appendChild(document.createTextNode("line breaking"));
+	container.appendChild(document.createElement("br"));
+	container.appendChild(document.createTextNode(" with "));
+	container.appendChild(document.createElement("br"));
+	container.appendChild(document.createElement("br"));
+	container.appendChild(document.createTextNode("multiple     "));
+	container.appendChild(document.createElement("br"));
+	container.appendChild(document.createElement("br"));
+	container.appendChild(document.createTextNode("renderers."));
+	container.style.cssText = style;
+	document.body.appendChild(container);
+}
+
+if (window.internals)
+	internals.settings.setSimpleLineLayoutEnabled(false)
+injectTextNodes(document.createElement("div"));
+injectTextNodes(document.createElement("div"), "width: 0px");
+injectTextNodes(document.createElement("div"), "width: 10px");
+injectTextNodes(document.createElement("div"), "width: 100px");
+injectTextNodes(document.createElement("pre"));
+injectTextNodes(document.createElement("pre"), "white-space: pre-wrap");
+injectTextNodes(document.createElement("pre"), "white-space: pre-wrap; width: 100px");
+</script>
+</body>
+</html>

LayoutTests/fast/text/simple-line-with-br.html

@@ -0,0 +1,38 @@
+<!DOCTYPE html>
+<html>
+<head>
+<title>Test that text content with <br> works fine with simple line layout.</title>
+</head>
+<body>
+<script>
+function injectTextNodes(container, style)
+{
+	container.appendChild(document.createElement("br"));
+	container.appendChild(document.createElement("br"));
+	container.appendChild(document.createTextNode("	"));
+	container.appendChild(document.createElement("br"));
+	container.appendChild(document.createTextNode("This tests"));
+	container.appendChild(document.createTextNode(" 	   "));
+	container.appendChild(document.createTextNode("line breaking"));
+	container.appendChild(document.createElement("br"));
+	container.appendChild(document.createTextNode(" with "));
+	container.appendChild(document.createElement("br"));
+	container.appendChild(document.createElement("br"));
+	container.appendChild(document.createTextNode("multiple     "));
+	container.appendChild(document.createElement("br"));
+	container.appendChild(document.createElement("br"));
+	container.appendChild(document.createTextNode("renderers."));
+	container.style.cssText = style;
+	document.body.appendChild(container);
+}
+
+injectTextNodes(document.createElement("div"));
+injectTextNodes(document.createElement("div"), "width: 0px");
+injectTextNodes(document.createElement("div"), "width: 10px");
+injectTextNodes(document.createElement("div"), "width: 100px");
+injectTextNodes(document.createElement("pre"));
+injectTextNodes(document.createElement("pre"), "white-space: pre-wrap");
+injectTextNodes(document.createElement("pre"), "white-space: pre-wrap; width: 100px");
+</script>
+</body>
+</html>

LayoutTests/platform/mac-mavericks/fast/parser/open-comment-in-textarea-expected.txt

@@ -8,11 +8,8 @@ layer at (0,0) size 800x600
 layer at (10,10) size 161x32 clip at (11,11) size 144x30 scrollHeight 56
   RenderTextControl {TEXTAREA} at (2,2) size 161x32 [bgcolor=#FFFFFF] [border: (1px solid #000000)]
     RenderBlock {DIV} at (3,3) size 140x52
-      RenderText {#text} at (0,0) size 140x39
+      RenderText {#text} at (0,0) size 138x39
         text run at (0,0) width 26: "<!--"
-        text run at (25,0) width 1: " "
         text run at (0,13) width 138: "This should be part of the"
-        text run at (137,13) width 3: " "
         text run at (0,26) width 47: "textarea."
-        text run at (46,26) width 1: " "
       RenderBR {BR} at (0,39) size 0x13

LayoutTests/platform/mac-mavericks/http/tests/navigation/javascriptlink-frames-expected.txt

@@ -108,7 +108,6 @@ layer at (0,0) size 800x600
             RenderBlock {DIV} at (3,3) size 224x26
               RenderText {#text} at (0,0) size 184x13
                 text run at (0,0) width 184: "More initial text before user input."
-                text run at (183,0) width 1: " "
               RenderBR {BR} at (0,13) size 0x13
       RenderFrame {FRAME} at (0,540) size 800x60
         layer at (0,0) size 785x90

LayoutTests/platform/mac/editing/pasteboard/5761530-1-expected.txt

@@ -0,0 +1,3 @@
+This tests to see that tabs are put into tab spans when they are copied individually. The pasted tab should be inside of a tab span, not a style span. To run the test manually, paste and then inspect the editable region, and ensure that there is a tab span at the beginning of the editable div.
+
+<span class="Apple-tab-span" style="white-space: pre;"> </span><span class="Apple-tab-span" style="white-space:pre;"> </span>xxx

LayoutTests/platform/mac/fast/css/text-overflow-ellipsis-bidi-expected.txt

@@ -9,7 +9,7 @@ layer at (0,0) size 800x200
         RenderBR {BR} at (579,0) size 1x18
         RenderText {#text} at (0,18) size 547x18
           text run at (0,18) width 547: "The ellipsis should appear on the left for the RTL case and on the right for LTR case. "
-        RenderBR {BR} at (0,0) size 0x0
+        RenderBR {BR} at (546,18) size 1x18
         RenderBR {BR} at (0,36) size 0x18
         RenderText {#text} at (0,54) size 62x18
           text run at (0,54) width 62: "RTL text:"

LayoutTests/platform/mac/fast/dom/focus-contenteditable-expected.txt

@@ -6,7 +6,7 @@ layer at (0,0) size 785x894
       RenderBlock (anonymous) at (0,0) size 769x36
         RenderText {#text} at (0,0) size 509x18
           text run at (0,0) width 509: "This test will try to call focus() on a contenteditable div, and then a normal div. "
-        RenderBR {BR} at (0,0) size 0x0
+        RenderBR {BR} at (508,14) size 1x0
         RenderText {#text} at (0,18) size 379x18
           text run at (0,18) width 379: "The window should scroll to reveal the contenteditable div."
       RenderBlock {DIV} at (0,36) size 500x800

LayoutTests/platform/mac/fast/forms/range/slider-padding-expected.txt

@@ -0,0 +1,16 @@
+layer at (0,0) size 800x600
+  RenderView at (0,0) size 800x600
+layer at (0,0) size 800x600
+  RenderBlock {HTML} at (0,0) size 800x600
+    RenderBody {BODY} at (8,8) size 784x579
+      RenderBlock (anonymous) at (0,0) size 784x18
+        RenderText {#text} at (0,0) size 330x18
+          text run at (0,0) width 330: "This tests that the slider control considers padding. "
+        RenderBR {BR} at (329,14) size 1x0
+      RenderBlock {DIV} at (0,18) size 784x39 [bgcolor=#ADD8E6]
+        RenderSlider {INPUT} at (2,2) size 100x35 [color=#909090] [bgcolor=#FFFFFF]
+          RenderFlexibleBox {DIV} at (10,10) size 80x15
+            RenderBlock {DIV} at (0,0) size 80x15
+              RenderBlock {DIV} at (0,0) size 15x15
+        RenderText {#text} at (0,0) size 0x0
+      RenderBlock {PRE} at (0,70) size 784x0

LayoutTests/platform/mac/fast/forms/textarea-scroll-height-expected.txt

@@ -12,42 +12,26 @@ layer at (8,8) size 200x200 clip at (9,9) size 183x198 scrollHeight 316
     RenderBlock {DIV} at (3,3) size 179x312
       RenderText {#text} at (0,0) size 84x299
         text run at (0,0) width 84: "Lots of content."
-        text run at (83,0) width 1: " "
         text run at (0,13) width 84: "Lots of content."
-        text run at (83,13) width 1: " "
         text run at (0,26) width 84: "Lots of content."
-        text run at (83,26) width 1: " "
         text run at (0,39) width 84: "Lots of content."
-        text run at (83,39) width 1: " "
         text run at (0,52) width 0: " "
         text run at (0,65) width 84: "Lots of content."
-        text run at (83,65) width 1: " "
         text run at (0,78) width 84: "Lots of content."
-        text run at (83,78) width 1: " "
         text run at (0,91) width 0: " "
         text run at (0,104) width 84: "Lots of content."
-        text run at (83,104) width 1: " "
         text run at (0,117) width 84: "Lots of content."
-        text run at (83,117) width 1: " "
         text run at (0,130) width 0: " "
         text run at (0,143) width 84: "Lots of content."
-        text run at (83,143) width 1: " "
         text run at (0,156) width 84: "Lots of content."
-        text run at (83,156) width 1: " "
         text run at (0,169) width 0: " "
         text run at (0,182) width 84: "Lots of content."
-        text run at (83,182) width 1: " "
         text run at (0,195) width 84: "Lots of content."
-        text run at (83,195) width 1: " "
         text run at (0,208) width 0: " "
         text run at (0,221) width 84: "Lots of content."
-        text run at (83,221) width 1: " "
         text run at (0,234) width 84: "Lots of content."
-        text run at (83,234) width 1: " "
         text run at (0,247) width 0: " "
         text run at (0,260) width 84: "Lots of content."
-        text run at (83,260) width 1: " "
         text run at (0,273) width 84: "Lots of content."
-        text run at (83,273) width 1: " "
         text run at (0,286) width 0: " "
       RenderBR {BR} at (0,299) size 0x13

LayoutTests/platform/mac/fast/parser/open-comment-in-textarea-expected.txt

@@ -8,11 +8,8 @@ layer at (0,0) size 800x600
 layer at (10,10) size 152x32 clip at (11,11) size 135x30 scrollHeight 56
   RenderTextControl {TEXTAREA} at (2,2) size 152x32 [bgcolor=#FFFFFF] [border: (1px solid #000000)]
     RenderBlock {DIV} at (3,3) size 131x52
-      RenderText {#text} at (0,0) size 119x39
+      RenderText {#text} at (0,0) size 116x39
         text run at (0,0) width 20: "<!--"
-        text run at (19,0) width 1: " "
         text run at (0,13) width 116: "This should be part of"
-        text run at (115,13) width 4: " "
         text run at (0,26) width 67: "the textarea."
-        text run at (66,26) width 1: " "
       RenderBR {BR} at (0,39) size 0x13

LayoutTests/platform/mac/fast/text/international/bidi-layout-across-linebreak-expected.txt

@@ -165,7 +165,7 @@ layer at (0,0) size 800x492
             RenderTableCell {TD} at (49,269) size 45x41 [border: (1px solid #008000)] [r=7 c=1 rs=1 cs=1]
               RenderText {#text} at (3,3) size 20x18
                 text run at (3,3) width 20: "a ("
-              RenderBR {BR} at (22,18) size 1x0
+              RenderBR {BR} at (22,3) size 1x18
               RenderText {#text} at (3,21) size 21x18
                 text run at (3,21) width 21: "] b"
             RenderTableCell {TD} at (94,269) size 33x41 [border: (1px solid #008000)] [r=7 c=2 rs=1 cs=1]

LayoutTests/platform/mac/fast/text/svg-font-face-with-kerning-expected.txt

@@ -0,0 +1,14 @@
+layer at (0,0) size 800x600
+  RenderView at (0,0) size 800x600
+layer at (0,0) size 800x600
+  RenderBlock {HTML} at (0,0) size 800x600
+    RenderBody {BODY} at (8,8) size 784x584
+      RenderBlock {DIV} at (0,0) size 230x90
+        RenderText {#text} at (0,1) size 207x34
+          text run at (0,1) width 207: "This is a test of kerning when"
+          text run at (0,19) width 157: "using SVG web fonts. "
+        RenderBR {BR} at (156,32) size 1x0
+        RenderBR {BR} at (0,37) size 0x16
+        RenderText {#text} at (0,55) size 230x34
+          text run at (0,55) width 230: "Wow, The V/A Team's Task Was"
+          text run at (0,73) width 85: "on Youtube."

LayoutTests/platform/mac/http/tests/navigation/javascriptlink-frames-expected.txt

@@ -108,7 +108,6 @@ layer at (0,0) size 800x600
             RenderBlock {DIV} at (3,3) size 211x26
               RenderText {#text} at (0,0) size 179x13
                 text run at (0,0) width 179: "More initial text before user input."
-                text run at (178,0) width 1: " "
               RenderBR {BR} at (0,13) size 0x13
       RenderFrame {FRAME} at (0,540) size 800x60
         layer at (0,0) size 785x90

LayoutTests/platform/mac/http/tests/navigation/postredirect-basic-expected.txt

@@ -6,18 +6,18 @@ layer at (0,0) size 800x600
       RenderText {#text} at (0,0) size 750x74
         text run at (0,0) width 750: "This is just a minimal page that we navigate in response to"
         text run at (0,37) width 217: "an HTTP POST. "
-      RenderBR {BR} at (0,0) size 0x0
+      RenderBR {BR} at (216,66) size 1x0
       RenderBR {BR} at (0,74) size 0x37
-      RenderText {#text} at (0,111) size 766x111
+      RenderText {#text} at (0,111) size 765x111
         text run at (0,111) width 743: "If the next line is empty after the colon, it probably means"
         text run at (0,148) width 179: "that we made "
-        text run at (178,148) width 588: "a mistake and requested this page with a GET"
+        text run at (178,148) width 587: "a mistake and requested this page with a GET"
         text run at (0,185) width 434: "with no query instead of a POST. "
-      RenderBR {BR} at (0,0) size 0x0
+      RenderBR {BR} at (433,214) size 1x0
       RenderBR {BR} at (0,222) size 0x37
       RenderText {#text} at (0,259) size 704x37
         text run at (0,259) width 704: "The first text field contained: New form text from user "
-      RenderBR {BR} at (0,0) size 0x0
+      RenderBR {BR} at (703,288) size 1x0
       RenderText {#text} at (0,296) size 574x37
         text run at (0,296) width 574: "This page was requested with an HTTP GET"
 

LayoutTests/platform/mac/http/tests/navigation/postredirect-goback1-expected.txt

@@ -6,18 +6,18 @@ layer at (0,0) size 800x600
       RenderText {#text} at (0,0) size 750x74
         text run at (0,0) width 750: "This is just a minimal page that we navigate in response to"
         text run at (0,37) width 217: "an HTTP POST. "
-      RenderBR {BR} at (0,0) size 0x0
+      RenderBR {BR} at (216,66) size 1x0
       RenderBR {BR} at (0,74) size 0x37
-      RenderText {#text} at (0,111) size 766x111
+      RenderText {#text} at (0,111) size 765x111
         text run at (0,111) width 743: "If the next line is empty after the colon, it probably means"
         text run at (0,148) width 179: "that we made "
-        text run at (178,148) width 588: "a mistake and requested this page with a GET"
+        text run at (178,148) width 587: "a mistake and requested this page with a GET"
         text run at (0,185) width 434: "with no query instead of a POST. "
-      RenderBR {BR} at (0,0) size 0x0
+      RenderBR {BR} at (433,214) size 1x0
       RenderBR {BR} at (0,222) size 0x37
       RenderText {#text} at (0,259) size 704x37
         text run at (0,259) width 704: "The first text field contained: New form text from user "
-      RenderBR {BR} at (0,0) size 0x0
+      RenderBR {BR} at (703,288) size 1x0
       RenderText {#text} at (0,296) size 574x37
         text run at (0,296) width 574: "This page was requested with an HTTP GET"