Julian Descottes 8a5bb348c4 Bug 1243131 - memory tool: select snapshot using ACCEL+{UP/DOWN};r=fitzgen
Adds a keydown listener on the memory panel window. Select previous/next snapshot
when user presses UP/DOWN with the accelKey modifier (metaKey on OSX, ctrlKey on
windows).

Keydown events with modifiers are no longer listened to by the tree node elements.

Updated tree node test.
Added new mochitest to test the new keyboard navigation on the census view. )
2016-02-12 11:03:34 +01:00
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