Commits on Oct 16, 2015

1. fix busy cursor on logout …

   Add busy cursor methods, with a reference counter.  Flush the cursor
   change to the display.  Reduce the time between checks for journal
   ready.
   
   Why?
   
   - the busy cursor effect was not re-entrant; if the busy cursor was
     already in use it would not be restored,
   
   - a previous patch to add busy cursor on logout never worked properly
     because the cursor change was not flushed to the display,
   
   - the busy cursor should be removed as soon as practical once the
     journal is ready.

   

   quozl committed Oct 16, 2015
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2. add session manager shutdown cancel …

   Add a cancel shutdown method to the session manager.  Remove a delay
   before final shutdown.
   
   Why?
   
   - a cancel method is needed by a later patch to handle hung activities,
   
   - the one second delay before final shutdown is unnecessary, and makes
     Sugar feel unresponsive.

   

   quozl committed Oct 16, 2015
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3. fix busy cursor on control panel …

   Add reference counted busy cursor methods, and flush the display.
   
   Why?
   
   - the busy cursor was delayed, because the change was not flushed,
   
   - a busy method will be useful for other delays in the control panel.

   

   quozl committed Oct 16, 2015
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4. methods for control panel alerts …

   Move the add and remove of alerts into new methods, for re-use.

   

   quozl committed Oct 16, 2015
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5. add quit failure alert …

   Add a quit failure alert to the menu and the control panel.  After 30
   seconds with no click, continue with the quit.
   
   Why?
   
   The buddy menu has options for shutdown, restart or logout.  The control
   panel may also restart.  These make Sugar quit.  Session manager sends a
   save-yourself message to running activities, and waits for the
   activities to respond.
   
   When an activity does not respond, Sugar does not quit.  No reason is
   given.
   
   Adding the alert will allow user to cancel the shutdown, cancel the
   control panel section change, and work the problem, or lose unsaved
   work.
   
   Caution: requires a patch to
   
       sugar-toolkit-gtk3:src/sugar3/graphics/alert.py
   
   otherwise a forced shutdown will occur 30 seconds after the alert is
   shown, even if Cancel is clicked.

   

   quozl committed Oct 16, 2015
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6. fix homewindow alerts …

   Remove previous stacked alerts implementation.  Remove alerts before
   changing zoom level.  Fix button pressed callback to
   
   No code was using alerts in the homewindow.  When it began to be used,
   changes to zoom level were ruining the ordering of children of self._box

   

   quozl committed Oct 16, 2015
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7. simplify register fail alert …

   Use ErrorAlert so that the Ok button need not be added.
   
   Connect before add to fit documented ordering.  No actual effect.

   

   quozl committed Oct 16, 2015
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8. ignore quit failure for developers …

   After a few seconds, force the session manager to shutdown if there
   remain activities that are not responding.
   
   	"just throw fire on everything and kill it anyway" -- Sam

   

   quozl committed Oct 16, 2015
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