[balsa: 2/2] Merge branch '77-notification' into 'master'

[Peter Bloomfield <peterb src gnome org>]

commit 682e6acca0ce9a8d730ca4881c857faf770bbf34
Merge: f7760d6c8 b07cdd374
Author: Peter Bloomfield <peterbloomfield bellsouth net>
Date:   Mon Aug 15 18:17:46 2022 +0000

    Merge branch '77-notification' into 'master'
    
    notification improvements: play sound, basic system tray icon support
    
    Closes #77
    
    See merge request GNOME/balsa!63

 configure.ac               |  20 ++++++-
 images/Makefile.am         |   1 +
 images/balsa_attention.png | Bin 0 -> 7951 bytes
 images/meson.build         |   1 +
 libbalsa/Makefile.am       |   2 +
 libbalsa/filter.c          |  15 ++---
 libbalsa/libbalsa.c        |  38 ++++++++++++
 libbalsa/libbalsa.h        |   7 +++
 libbalsa/meson.build       |   2 +
 libbalsa/system-tray.c     | 142 +++++++++++++++++++++++++++++++++++++++++++++
 libbalsa/system-tray.h     |  55 ++++++++++++++++++
 meson.build                |  14 +++--
 meson_options.txt          |   7 ++-
 src/balsa-app.c            |  10 +++-
 src/balsa-app.h            |  11 ++--
 src/main-window.c          | 103 +++++++++++++++++++++++++++++++-
 src/pref-manager.c         |  97 ++++++++++++++++++++-----------
 src/save-restore.c         |  19 ++++--
 18 files changed, 478 insertions(+), 66 deletions(-)
---