[gtk/matthiasc/for-master: 1/2] docs: Mention <packing> in migration guide




commit c4cbd6ec1b3cec362f2e04c5ea2a0beb082cc47b
Author: Matthias Clasen <mclasen redhat com>
Date:   Fri Jun 4 07:41:25 2021 -0400

    docs: Mention <packing> in migration guide
    
    Add another hint for what to do with child properties.
    
    Fixes: #3950

 docs/reference/gtk/migrating-3to4.md | 5 +++++
 1 file changed, 5 insertions(+)
---
diff --git a/docs/reference/gtk/migrating-3to4.md b/docs/reference/gtk/migrating-3to4.md
index a97f9ea8bb..ad0f248c18 100644
--- a/docs/reference/gtk/migrating-3to4.md
+++ b/docs/reference/gtk/migrating-3to4.md
@@ -804,6 +804,11 @@ by a layout manager (if they are layout-related), or handled in some
 other way. One possibility is to use child meta objects, as seen with
 [class@Gtk.AssistantPage], [class@Gtk.StackPage] and the like.
 
+If you used to define child properties with `<packing>` in ui files, you have
+to switch to using `<layout>` for the corresponding layout properties.
+`gtk4-builder-tool` can help with this conversion, with the `--3to4` option
+of the `simplify` command.
+
 The replacements for gtk_container_add() are:
 
 | Widget | Replacement |


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