[geary: 2/2] Merge branch 'wip/weak-refs-for-callback-managers' into 'master'

[Michael Gratton <mjog src gnome org>]

commit 2c4fe9b77fddda2f18ecd64d8c49cc6ac9881742
Merge: 44471375 3cda1b5c
Author: Michael Gratton <mike vee net>
Date:   Mon Feb 18 00:39:32 2019 +0000

    Merge branch 'wip/weak-refs-for-callback-managers' into 'master'
    
    Prevent circular refs using idle and timeout manager when running
    
    See merge request GNOME/geary!110

 src/engine/util/util-idle-manager.vala     | 53 ++++++++++++++++++++++++-----
 src/engine/util/util-timeout-manager.vala  | 54 +++++++++++++++++++++++-------
 test/engine/util-idle-manager-test.vala    | 40 ++++++++++++++++++++++
 test/engine/util-timeout-manager-test.vala | 45 +++++++++++++++++++++++++
 4 files changed, 171 insertions(+), 21 deletions(-)
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