[Webkit-unassigned] [Bug 47806] Text inserted at the collapsed selection between two BRs following a non-wrapping text that forces a horizontal scrollbar is not rendered

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=47806





--- Comment #9 from James Robinson <jamesr at chromium.org>  2010-11-05 14:51:04 PST ---
After the page has stabilized the <pre> has three RenderText children:

      RenderBlock 0x7fffeaaad018           PRE    0x7fffeaaaed80 STYLE=width: 35ex; height: 10em; overflow: scroll;
        RenderText 0x7fffeaaaec98          #text    0x7fffeaa95720 "You should see 'PASS' below: ----------"
        RenderBR 0x7ffff7ed91c8            BR    0x7fffeaaaec00
        RenderText 0x7fffeb5bfb98          #text    0x7fffeb5a17e0 "hello"
        RenderBR 0x7ffff7ed9138            BR    0x7fffeaaaeb80
        RenderText 0x7fffeaaaeb18          #text    0x7fffeaa956c0 " \n"

that correspond to three inline boxes in its linebox list:

$26 = {<WebCore::InlineBox> = {_vptr.InlineBox = 0x3cae730, m_next = 0x0, m_prev = 0x0, m_parent = 0x0, m_renderer = 0x7fffeaaad018, m_x = 0, m_y = 0, m_logicalWidth = 312, m_firstLine = true, 
    m_constructed = true, m_bidiEmbeddingLevel = 0 '\000', m_dirty = false, m_extracted = false, m_hasVirtualLogicalHeight = false, m_isHorizontal = true, m_endsWithBreak = false, 
    m_hasSelectedChildren = false, m_hasEllipsisBoxOrHyphen = false, m_dirOverride = false, m_isText = false, m_determinedIfNextOnLineExists = false, m_determinedIfPrevOnLineExists = false, 
    m_nextOnLineExists = false, m_prevOnLineExists = false, m_toAdd = 0, m_hasBadParent = false}, m_overflow = {<WTFNoncopyable::Noncopyable> = {<WTF::FastAllocBase> = {<No data fields>}, <No data fields>}, 
    m_ptr = 0x0}, m_firstChild = 0x7fffeaa3d248, m_lastChild = 0x7fffeaa3d248, m_prevLineBox = 0x0, m_nextLineBox = 0x7fffeb5ef318, m_includeLogicalLeftEdge = false, m_includeLogicalRightEdge = false, 
  m_hasTextChildren = true, m_hasBadChildList = false}
(gdb) p *$.m_nextLineBox 
$27 = {<WebCore::InlineBox> = {_vptr.InlineBox = 0x3cae730, m_next = 0x0, m_prev = 0x0, m_parent = 0x0, m_renderer = 0x7fffeaaad018, m_x = 0, m_y = 16, m_logicalWidth = 0, m_firstLine = false, 
    m_constructed = true, m_bidiEmbeddingLevel = 0 '\000', m_dirty = false, m_extracted = false, m_hasVirtualLogicalHeight = false, m_isHorizontal = true, m_endsWithBreak = true, 
    m_hasSelectedChildren = false, m_hasEllipsisBoxOrHyphen = false, m_dirOverride = false, m_isText = false, m_determinedIfNextOnLineExists = false, m_determinedIfPrevOnLineExists = false, 
    m_nextOnLineExists = false, m_prevOnLineExists = false, m_toAdd = 0, m_hasBadParent = false}, m_overflow = {<WTFNoncopyable::Noncopyable> = {<WTF::FastAllocBase> = {<No data fields>}, <No data fields>}, 
    m_ptr = 0x0}, m_firstChild = 0x7fffeaa3d1d8, m_lastChild = 0x7fffeaa3d1d8, m_prevLineBox = 0x7fffeb5ef3d8, m_nextLineBox = 0x7fffeb5ef258, m_includeLogicalLeftEdge = false, 
  m_includeLogicalRightEdge = false, m_hasTextChildren = true, m_hasBadChildList = false}
(gdb) p *$.m_nextLineBox 
$28 = {<WebCore::InlineBox> = {_vptr.InlineBox = 0x3cae730, m_next = 0x0, m_prev = 0x0, m_parent = 0x0, m_renderer = 0x7fffeaaad018, m_x = 0, m_y = 32, m_logicalWidth = 8, m_firstLine = false, 
    m_constructed = true, m_bidiEmbeddingLevel = 0 '\000', m_dirty = false, m_extracted = false, m_hasVirtualLogicalHeight = false, m_isHorizontal = true, m_endsWithBreak = true, 
    m_hasSelectedChildren = false, m_hasEllipsisBoxOrHyphen = false, m_dirOverride = false, m_isText = false, m_determinedIfNextOnLineExists = false, m_determinedIfPrevOnLineExists = false, 
    m_nextOnLineExists = false, m_prevOnLineExists = false, m_toAdd = 0, m_hasBadParent = false}, m_overflow = {<WTFNoncopyable::Noncopyable> = {<WTF::FastAllocBase> = {<No data fields>}, <No data fields>}, 
    m_ptr = 0x0}, m_firstChild = 0x7fffeaa3d168, m_lastChild = 0x7fffe6dfea28, m_prevLineBox = 0x7fffeb5ef318, m_nextLineBox = 0x0, m_includeLogicalLeftEdge = false, m_includeLogicalRightEdge = false, 
  m_hasTextChildren = true, m_hasBadChildList = false}


I'm not sure why the second line box has a m_logicalWidth of 0.  If I load up a similar page with the same contents as static HTML rather than dynamically created the second linebox has a m_logicalWidth of 40 which seems like a much more reasonable value.

I don't know enough about the line breaker to debug much more usefully.

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