LayoutTests:

LayoutTests:

        Reviewed by Maciej.

        Test for: <rdar://problem/4644614> REGRESSION: Typing, pasting or dragging in new text areas causes unnecessary scrolling

        * fast/forms/textarea-scrolled-type-expected.checksum: Added.
        * fast/forms/textarea-scrolled-type-expected.png: Added.
        * fast/forms/textarea-scrolled-type-expected.txt: Added.
        * fast/forms/textarea-scrolled-type.html: Added.

WebCore:

        Reviewed by Maciej.

        - Fix for <rdar://problem/4644614> REGRESSION: Typing, pasting or dragging in new text areas causes unnecessary scrolling

        * rendering/RenderBlock.cpp: (WebCore::RenderBlock::layoutBlock): Don't updateScrollInfoAfterLayout if an ancestor flexible box is just on
        its first layout.
        * rendering/RenderFlexibleBox.cpp:
        (WebCore::RenderFlexibleBox::layoutBlock): ditto.
        (WebCore::RenderFlexibleBox::layoutVerticalBox): Let the view know if this flex box is doing its first pass at layout.

        * rendering/RenderView.cpp: (WebCore::RenderView::RenderView): Caches a flexible box that's doing its first layout.
        * rendering/RenderView.h:
        (WebCore::RenderView::setFlexBoxInFirstLayout):
        (WebCore::RenderView::flexBoxInFirstLayout):

git-svn-id: https://svn.webkit.org/repository/webkit/trunk@15581 268f45cc-cd09-0410-ab3c-d52691b4dbfc