Do not complete command switches after --

Recently, switch completion were given the menu behavior.
Unfortunately this breaks cases like

	:echo -- -mark<ret>

where the hypothetical user wanted to actually display "-mark", not
"-markup".

Simply bail if there is a double-dash. This is not fully correct,
for example it wrongly disables switch completion on

	echo -to-file -- -

but that's minor, we can fix it later.

In future, we should reuse the ParametersParser when computing completions,
which will obsolete this workaround.

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