feat(gtk3): bind dialog transient parent using RawWindowHandle - #327
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Resolve RawWindowHandle to GtkWindow at runtime by iterating gtk_window_list_toplevels and matching via dlsym-loaded gdk_x11_window_get_xid (Xlib/XCB) or gdk_wayland_window_get_wl_surface (Wayland). Set the resolved GtkWindow as transient parent for both file chooser and message dialogs, enabling proper window manager modality and GNOME CSD sheet-style dialog attachment. Per GNOME HIG: "Dialogs should always have a parent window, to which they are modal."
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Summary
Implement parent window binding in the GTK3 backend using
RawWindowHandle(supporting X11 and Wayland).Currently,
rfdhas a cross-platform API for setting a parent window via.set_parent(). However, while this was supported on Windows, macOS, and the XDG portal backend, the native GTK3 backend completely ignored the parent window parameter and hardcodedptr::null_mut().This PR dynamically resolves the
GtkWindowpointer corresponding to the providedRawWindowHandleby searching the list of top-levels usinggdk_x11_window_get_xid(X11) andgdk_wayland_window_get_wl_surface(Wayland) resolved at runtime viadlsym.This ensures that: