The check `key.startswith('<') and key.endswith('>') is repeated many
times in code to check for a special key. Replace all these with a call
to the same function.
For some reason, when comparing the repr in the two processes, we get different
results on OS X and Windows:
- expected: "fünf"
- "f\xfcnf" coming back from the subprocess on OS X
- "fnf" on Windows
Instead we're comparing the json dump now, which should be more predictable.
There are a lot of problems and flakiness with using a real clipboard.
Instead we now have a :debug-set-fake-clipboard command to set a text, and use
logging when getting the contents.
Fixes#1285.
This broke the tests for older PyQt versions because the test had a
test_utils.Color(test_utils.Color(...)) object (double-wrapped), and the
comparisons failed there for some reason.
