[Webkit-unassigned] [Bug 29574] New: [Qt] Style changes to webpage by javascript triggered by signals doe sn't take effect immediately

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=29574

           Summary: [Qt] Style changes to webpage by javascript triggered
                    by signals doe sn't take effect immediately
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Other
        OS/Version: Mac OS X 10.5
            Status: NEW
          Keywords: Qt
          Severity: Normal
          Priority: P2
         Component: New Bugs
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: vestbo at webkit.org


This bug report originated from Nokia internal issue QT-1807


--- Comments ---

Product
Qt

Function
webkit

Version
4.5.0

Platform
Linux

Platform details
Using 4.5.0-0ubuntu4.1 as supplied by Ubuntu.

Also tested on 4.5.2 with a recent webkit svn revision by Chaz6 in #qtwebkit

Compilers
GCC

Compiler details

Subject
Style changes to webpage by javascript triggered by signals doesn't take effect
immediately

Steps to reproduce / test case
1. Create a QWebView and add a QObject to its javascript.
2. Connect a javascript function to a signal on QObject.
3. Emit the signal, and have the handler makes a change to the document's
background color.

Results:
The changes to the page will not take effect until one of the following:
1) Hover over the widget with the mouse cursor.
2) Make a dom manipulation to the document (before or after the css change).
3) Cause an alert.

More information
The test-case has a button and a webview.
clicking on the button prints a message to stdout (via the javascript object)
and should cause the webview to turn blue.

It doesn't turn blue until hovering over it with the mouse.
In the source code, the handler function has two dom manipulations before and
after the css change.
Uncommenting any of them will cause the color to change immediately without a
mouse hover.
I filed this bug in webkit's bugzilla.

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