Fixes#1060.
In the process of adding this, I also decided to rewrite
mainwindow.get_window() for clarity (and also because flake8 was warning
about complexity).
Also adds some tests to the new-instance-target mechanism, in particular
a specific test for the issue in question.
With the addition of :window-only, it's no longer necessary to use
"Given I have a fresh instance" to clean up previous windows. This
greatly cuts down on the amount of process restarts that need to happen
to complete a full testing cycle.
I also made one of the tests more robust against order alterations, and
removed some unnecessary extra commands that were already implied by the
background on others.
This means we don't get a QProcess message because of test_no_loglines
not sending :quit, and we don't need to do so in test_ascii_locale as
there's nothing we need to wait for.
This adds the ability to open new tabs in the last-focused window
instead, which fixes#1801.
Right now the only other option is probably not that useful for human
users but it's required to make tests behave deterministically and
consistently. (But with #881 on the roadmap, I would implement this as
another choice)
To this end, also make the test framework set this option to preserve
the invariant against which existing tests are written: that spawning a
new window would effectively also focus it.
This allows a specific keybinding, for whatever reason, to override the
default mode. Examples of when this could be useful:
* :hint --rapid --mode=word (to type them more rapidly)
* :hint --mode=letter input (if the default mode is number)
Also reword the description of 'group' to make the distinction between
'group' and 'mode' clearer.
Changes :yank's flag arguments to a positional "what" argument
specifying the object to be yanked. Including "selection" as a
possibility allows for the replacement of :yank-selected with
:yank selection.
webelem.javascript_escape got renamed to javascript.string_escape, and a
new javascript.assemble got added to make it easier to call a function
inside a .js file.
:hint all download does not use the response headers to determine the
filename (the prompt is shown before a request is even done), so our
long filename was pretty useless.
:hint works because it does a request first and uses the right filename,
but we need to wait until the prompt is shown before we can do
:prompt-open-download, since the request is a bit slower and would fail
otherwise.
