I've been experimenting with embedding a webview (https://github.com/webview/webview) in an fltk application.

This works by just passing an fl_xid of an Fl_Window to the webview_create function which accepts an opaque pointer to either a HWND, NSWindow or GtkWindow depending on the platform.

- On Windows, things work fine.

- On MacOS, any manipulation of the embedded window throws an objc exception (doesn't crash) of unrecognized selector "did_view_resolution_change" to WKWebView.

"did_view_resolution_change" is a method of FLView which inherits NSView (in fl_cocoa.mm). I'm not entirely sure why it's being automatically triggered here or if there's a way to override it or "swizzle" it (I'm not familiar with Objective-C).

- On linux, I'm getting the idea that trying to construct GtkWindow from an Fl_Window is quite complex. Apparently it's possible to construct a GdkWindow from an XID, however getting a GtkWindow from a GdkWindow is not possible. I'm not sure of any other way to do it. I would appreciate any insight on the feasibility of doing this.

Thank you