[Bugs] #475 NORM: Activities need a way to disable Esc to exit fullscreen.

[SugarLabs Bugs]

#475: Activities need a way to disable Esc to exit fullscreen.
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    Reporter:  wadeb        |          Owner:  tomeu                      
        Type:  defect       |         Status:  new                        
    Priority:  Normal       |      Milestone:  Unspecified by Release Team
   Component:  sugar        |        Version:  Git as of bugdate          
    Severity:  Minor        |       Keywords:                             
Distribution:  Unspecified  |   Status_field:  Unconfimed                 
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 Currently sugar.graphics.Window intercepts key presses in order to check
 for Tray hiding (Alt+Space) and to exit Fullscreen mode (Esc).

 First, I argue that Esc is not needed since a) Alt Enter already works and
 b) An icon is present in the corner.  No matter which way the user got
 into fullscreen mode - icon or hotkey - the same action will get them out.

 Second, Terminal based activities need a way to disable this behavior as
 Esc is a commonly used hotkey in programs like VIM.  Since this is not
 enabled by a standard accelerator, there is no way to turn it off, short
 of intercepting key presses and not letting them pass through.

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Ticket URL: <http://dev.sugarlabs.org/ticket/475>
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