Make `Widget.get_style_context() const` return a `StyleContext const`?

Daniel Boles via gtkmm-list <[email protected]> Tue, 10 Dec 2019 15:05:25 +0000

Newsgroups	gmane.comp.gnome.gtkmm
Message-ID	<CAKChMKMtrS8Det+XH95Kk7-rn2LL6vNxoatdNY=GsLbnqJpxgg@mail.gmail.com>

I suspect this might have been asked and discredited already, so if it has,
apologies and link me :)

In gtk/src/widget.hg we have:

```
  _WRAP_METHOD(Glib::RefPtr<StyleContext> get_style_context(),
gtk_widget_get_style_context, refreturn)
  _WRAP_METHOD(Glib::RefPtr<Gtk::StyleContext> get_style_context() const,
gtk_widget_get_style_context, refreturn, constversion)
```

Should the const version return a RefPtr to a `const StyleContext`? I feel
like perhaps it should.

If we have the style context, we can change how the widget is drawn, which
is arguably quite a non-const thing to do with something whose main purpose
is to be displayed :-)

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