Show the palette buttons in the action bar
Show the palette buttons in the action bar

Also change the action bar to be aggressive about setting itself as the gesture
responder so that touch events go directly to it. Unfortunately, it looks like
you can still tap on expressions behind the action bar, so I'll have to
investigate that.

alangpierce/LambdaCalculusPlayground,alangpierce/LambdaCalculusPlayground,alangpierce/LambdaCalculusPlayground