[Webkit-unassigned] [Bug 215719] Facebook post with lots of comments has cut off scrollbar, and can't scroll fully to the bottom (sticky)

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=215719

--- Comment #8 from zalan <zalan at apple.com> ---
fails: fixed 'height: 300px;' -> incorrect scrollable overflow. 

(B)lock/(I)nline/I(N)line-block, (A)bsolute/Fi(X)ed/(R)elative/Stic(K)y, (F)loating, (O)verflow clip, Anon(Y)mous, (G)enerated, has(L)ayer, (C)omposited, (+)Dirty style, (+)Dirty layout
B---YGL- --* RenderView at (0,0) size 2302x1252 renderer->(0x1465f9240)
B-----L- --    HTML RenderBlock at (0,0) size 2302x1252 renderer->(0x1465f96f0) node->(0x1465fb920)
B------- --      BODY RenderBody at (8,8) size 2286x1236 renderer->(0x1465f9820) node->(0x1465fbb00)
B--O--L- --        DIV RenderBlock at (0,0) size 2286x504 renderer->(0x1465faca0) node->(0x1465fab50) (layout overflow 2,2 2267x610)
B------- --          DIV RenderBlock at (2,2) size 2267x300 renderer->(0x14772c1b0) node->(0x1465fbb90) (layout overflow 0,0 2267x610) (visual overflow 0,0 2267x610)
B------- --            DIV RenderBlock at (0,0) size 100x610 renderer->(0x14772c2e0) node->(0x1465fbc20)
BK----L- --            DIV RenderBlock at (0,500) size 100x110 renderer->(0x14772c410) node->(0x1465fbcb0)

works: fixed 'height: 300px;' -> child 'height: auto' -> used height 720px; -> correct delegated scrollable overflow. 
(B)lock/(I)nline/I(N)line-block, (A)bsolute/Fi(X)ed/(R)elative/Stic(K)y, (F)loating, (O)verflow clip, Anon(Y)mous, (G)enerated, has(L)ayer, (C)omposited, (+)Dirty style, (+)Dirty layout
B---YGL- --* RenderView at (0,0) size 2302x1252 renderer->(0x1465f9240)
B-----L- --    HTML RenderBlock at (0,0) size 2302x1252 renderer->(0x1465f96f0) node->(0x1465fb920)
B------- --      BODY RenderBody at (8,8) size 2286x1236 renderer->(0x1465f9820) node->(0x1465fbb00)
B--O--L- --        DIV RenderBlock at (0,0) size 2286x504 renderer->(0x1465faca0) node->(0x1465fab50) (layout overflow 2,2 2267x720)
B------- --          DIV RenderBlock at (2,2) size 2267x300 renderer->(0x14772c1b0) node->(0x1465fbb90) (layout overflow 0,0 2267x720) (visual overflow 0,0 2267x720)
B------- --            DIV RenderBlock at (0,0) size 2267x720 renderer->(0x14772c2e0) node->(0x1465fbc20)
B------- --              DIV RenderBlock at (0,0) size 100x610 renderer->(0x14772c410) node->(0x1465fbcb0)
BK----L- --              DIV RenderBlock at (0,375) size 100x110 renderer->(0x14772d660) node->(0x1465fbda0)

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