[Bugs] #4912 Sugar LOW: background control panel alpha level may set wrongly

[Sugar Labs Bugs]

#4912: background control panel alpha level may set wrongly
-------------------------------+--------------------------------
       Reporter:  quozl        |       Owner:
           Type:  defect       |      Status:  new
       Priority:  Low          |   Milestone:  Unspecified
      Component:  Sugar        |     Version:  Git as of bugdate
       Severity:  Minor        |    Keywords:
Distribution/OS:  Unspecified  |  Bug Status:  New
-------------------------------+--------------------------------
 Reproducer: instrument the model.py to log changes to alpha level, then
 use the alpha level buttons on the background control panel.

 The calls to the model are inconsistent with user actions.

 Sometimes the saved alpha level is not what the user intended.

  * the _set_alpha_cb in the view is called twice for every click, once for
 the radio button which was active, and once for the radio button which is
 now active; widget.get_active() could be used to filter the calls to
 ignore the deactivated button.

  * the _set_alpha_cb in the view is called when the alpha level buttons
 are being created; connect() could be called after all the buttons are
 created instead of after each button is created.

--
Ticket URL: <https://bugs.sugarlabs.org/ticket/4912>
Sugar Labs <http://sugarlabs.org/>
Sugar Labs bug tracking system