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Version 3.28.4
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Changes in this release:

 • Fixes for ref counting on titlebar widget
 • Fix a leak in DzlBoldingLabel of Pango attribute lists
 • Action muxer is now more defensive about string usage
 • Menu popover is now more defensive when destroying widgets
 • A potential, albeit unlikely, leak was plugged in signal dispatching
   via the shortcut engine.
 • The shortcut controller is now more defensive during widget destruction.