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Add arrow key navigation to the treeview

Harry Mallon requested to merge hjmallon/baobab:keynav into master

This change adds some arrow key navigation to Baobab.

First a disclaimer: I have never written any Vala or any GTK+ code. I may be missing something obvious.

Features:

  • Right arrow unfolds selected item
  • Left arrow folds the selected item if unfolded
  • Left arrow moves cursor to parent if folded
  • Space bar toggles folding on current item
Edited by Harry Mallon

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