[GTK][WPE] Signal "window-object-cleared" not emitted unless frame js context is get before

[Adrian Perez]

Created attachment 420028 [details]
Example web process extension source

Using a custom WebKitScriptWorld in a web process extension never triggers
the “window-object-cleared” signal. This can be verified with a simple web
process extension like the attached one (“ext.c”).

To reproduce the issue:

 1. Build the example extension:

      $CC -shared -o libext.so ext.c \
          $(pkg-config --libs --cflags wpe-web-extension-1.0)

 2. The run Cog passing the path to the directory containing the built
    “libext.so” file:
 
      cog -P fdo --web-extensions-dir="$(pwd)" ddg.gg

The expected (correct) output should include the following two lines:

   ** Message: 19:17:26.517: --> on_window_object_cleared
   ** Message: 19:17:26.517: <-- on_window_object_cleared

Building the extension with “-DHACK_FOR_CUSTOM_SCRIPT_WORLD” will use a
workaround that GNOME Web is currently using, see:

  https://gitlab.gnome.org/GNOME/epiphany/-/blob/8f833666c384a9c9f5d376ff15595e8bbece90a3/embed/web-process-extension/ephy-web-process-extension.c#L234

Current trunk and stable versions of WebKit (2.30.x, both GTK and WPE ports)
do *not* need the workaround when using the default WebKitScriptWorld.

[Carlos Garcia Campos]

This is happening for default script world too.

[Carlos Garcia Campos]

Created attachment 430573 [details]
Patch

[EWS Watchlist]

Thanks for the patch. If this patch contains new public API please make sure it follows the guidelines for new WebKit2 GTK+ API. See https://trac.webkit.org/wiki/WebKitGTK/AddingNewWebKit2API

[Carlos Garcia Campos]

Committed r278548 (238546@main): <https://commits.webkit.org/238546@main>

[Radar WebKit Bug Importer]

<rdar://problem/78938532>