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docs: Mention GtkImage and GtkPicture changes

Closes #4415

See merge request GNOME/gtk!4251
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Matthias Clasen 2021-12-17 00:32:08 +00:00
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docs/reference/gtk/migrating-3to4.md
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@ -1276,6 +1276,15 @@ is provided in the form of a `GtkIconPaintable` (this can be checked with
[method@Gtk.IconPaintable.is_symbolic]), you have to call
[method@Gtk.IconPaintable.get_icon_name] and set the icon name on a `GtkImage`.
### Adapt to GtkImage changes
`GtkPicture`'s behaviour was "split out" of `GtkImage` as the latter was covering
too many use cases; if you're loading an icon, [class@Gtk.Image] in GTK3 and GTK4 are
perfectly equivalent. If you are loading a more complex image asset, like a picture
or a thumbnail, then [class@Gtk.Picture] is the appropriate widget.
One noteworthy distinction is that while `GtkImage` has its size computed by
GTK, `GtkPicture` lets you decide about the size.
### Update to GtkFileChooser API changes
`GtkFileChooser` moved to a GFile-based API. If you need to convert a path