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Signed-off-by: Josh Morman <jmorman@gnuradio.org>
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A confluence of bugs introduced while updating GRC to Python 3 results
in keystrokes being sent to the drawing area while typing in the block
search box.
First, the drawing area needs to be placed in a Viewport before being
added into a ScrolledWindow. Fixing this allows the drawing area to grab
focus as intended when it is clicked.
Second, the drawing area needs to unselect all blocks when it loses
focus so that the relevant keystroke actions can be disabled. This
functionality was commented out during the transition to Python 3, and
I've restored it here.
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All of the removed `from __future__ import` were needed in older
versions of Python (mostly 2.5.x and below) but later became mandatory
in most versions of Python 3 hence are not necessary anymore.
More specifically, according to __future__.py[1]:
- unicode_literals is part of Python since versions 2.6.0 and 3.0.0;
- print_function is part of Python since versions 2.6.0 and 3.0.0;
- absolute_import is part of Python since versions 2.5.0 and 3.0.0;
- division is part of Python since versions 2.2.0 and 3.0.0;
Get rid of those unnecessary imports to slightly clean up the codebase.
[1] https://github.com/python/cpython/blob/master/Lib/__future__.py
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Fixes #3294.
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