[Webkit-unassigned] [Bug 138142] New: Unregistering and re-registering a user message handler does not work

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=138142

            Bug ID: 138142
           Summary: Unregistering and re-registering a user message
                    handler does not work
    Classification: Unclassified
           Product: WebKit
           Version: 528+ (Nightly build)
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: WebCore JavaScript
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: aperez at igalia.com

User script messages sent with “window.webkit.messageHandlers.<name>.postMessage()”
will not work (i.e. “WebScriptMessageHandler::Client::didPostMessage()” is not called)
after performing the following sequence of operations:

 1. Register a handler with “WebUserContentControllerProxy::addUserScriptMessageHandler()”
 2. Unregister the handler with “WebUserContentControllerProxy::removeUserMessageHandlerForName()”
 3. Register again a handler with the same name as in step (1) using
    “WebUserContentControllerProxy::addUserScriptMessageHandler()”

This probably means that either removing the handler does not do all the cleanup it
should and the logic for installing a handler fails when trying to add one with a
name used previously.

I have found this issue while writing the unit tests for the API of the GTK+
port, being worked in bug #133730

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