[Webkit-unassigned] [Bug 121419] New: [GTK] [Stable] [Regression] document.body.scrollTop is always 0

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=121419

           Summary: [GTK] [Stable] [Regression] document.body.scrollTop is
                    always 0
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Unspecified
        OS/Version: Unspecified
            Status: UNCONFIRMED
          Severity: Normal
          Priority: P2
         Component: WebKit Gtk
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: gdesmott at gnome.org


Original bug report: https://bugzilla.gnome.org/show_bug.cgi?id=707781

- Start an empathy chat and reduce the window size so the vertical scrollbar appears
- Move up the scrollbar so the latest lines aren't visible
- Send a message

Expected result: the window scroll down so the sent message is visible
Actual result: the window doesn't scroll down

Empathy uses a nearBottom() JS function (empathy/data/Template.html) to check if it should automatically scroll down when a new message is displayed. This function is broken because document.body.scrollTop is always 0, ignoring the actual position of the scrollbar.

This can also be easily reproduced using the WebKit inspector to check the value of scrollTop. Just use 'gsettings set org.gnome.Empathy.conversation enable-webkit-developer-tools true' and then right click in the chat window.

I can only reproduce this bug using webkit-2.2 branch. It works fine using 2.0.4 so that's probably a regression.

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