[amtk] Write more notes for future maintainers

[Sébastien Wilmet <swilmet src gnome org>]

commit 3d0813c7f1d2579cb8bfed5ea2c0683a0703254c
Author: Sébastien Wilmet <swilmet gnome org>
Date:   Sun Aug 12 12:43:44 2018 +0200

    Write more notes for future maintainers

 HACKING    |  2 ++
 amtk/NOTES | 13 +++++++++++--
 2 files changed, 13 insertions(+), 2 deletions(-)
---
diff --git a/HACKING b/HACKING
index dd870f9..4e6a0bf 100644
--- a/HACKING
+++ b/HACKING
@@ -8,3 +8,5 @@ Amtk follows the same guidelines and code conventions as GtkSourceView:
 The Amtk GitLab:
 
     https://gitlab.gnome.org/GNOME/amtk
+
+See also the amtk/NOTES file.
diff --git a/amtk/NOTES b/amtk/NOTES
index 602aa3d..8f003c2 100644
--- a/amtk/NOTES
+++ b/amtk/NOTES
@@ -4,8 +4,15 @@ Amtk notes
 TODO list
 ---------
 
+- Support detailed GAction names in factory functions:
+       - In AmtkActionInfo, document that the "action name" can be a detailed
+         action name, with a reference to g_action_parse_detailed_name().
+       - In AmtkFactory, call gtk_actionable_set_detailed_action_name() and
+         adapt docs.
+       - Adapt docs and code in other classes if needed (but I think it's only
+         in AmtkActionInfo and AmtkFactory).
+
 - Implement more factory functions.
-- Support detailed GAction names in factory functions.
 
 Other possible things to do
 ---------------------------
@@ -23,7 +30,9 @@ Other possible things to do
   accordingly.
 
 - Add one more sanity check: check that a GAction is *implemented* when (or
-  after) creating a menu or toolbar item for that action?
+  after) creating a menu or toolbar item for that action? Because currently
+  when the GAction is not implemented, the menu/toolbar item is just
+  insensitive, there is no warning.
 
 - An AmtkActionInfo could have a field for the default AmtkFactoryFlags (or to
   force some flags). For example setting AMTK_FACTORY_IGNORE_ACCELS_FOR_APP for