Although we can re-construct a gdk.GdkWindow.ptr from natvieHandle (address of
the actual GdkWindow), we can't seem to be able to use it. For ex.,
gdk_window_get_user_data(), which should return a pointer to the corresponding
GtkWindow, returns strange adresses with our re-constructed pointer (0x11,
0x19, 0x0, ...)
...and despite the fact that both the "original" gdk.GdkWindow.ptr and the
re-constructed one do point to the same address, and that GDK_IS_WINDOW (macro
here wrapped into an embedded lib) is returning true for both pointers...
export 'Cc' and 'Ci' in common.js module. This helps managing the different
behaviours in FF and TB: TB requires Ci and Cc to be defined explicitly in
overlay.js, and FF fails to load overlay.js silently when Ci and Cc are defined
explicitly (const defined twice ?)...
