Get rid of spacebar shortcut for expanding nodes
The spacebar should be reserved for striking-out (completing) nodes, and nothing else. At the moment, if you want to strike-out a whole tree, you have to tap the spacebar once, which 'expands' the node, tap another time to strikeout the whole tree, and then hit the left arrow to recollapse it. This would be wholly unnecessary if collapsing / expanding was reserved for the left/right arrow keys, and not the spacebar.
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Sorry, I don't think this is a good idea.
It could be really unsafe to complete the whole tree of nodes without looking at what is there.
You can complete notes which you don't remember about, or were added by another person.
What can be done here, though, is an automatic collapse of the just expanded node after completion.
What do you think?