zsh completion: disable defaults and verbose output when completing
If ui.verbose is set to True in hgrc, commands used to provide completions
would yield bad results. For example, qpush completion would include the
patch numbers and statuses as returned by qunapplied -v, instead of just
the patch names.
Defaults are also disabled when completing to prevent similar issues when
an option is set that changes a command's output.
% empty directory
initializing destination source-hg repository
scanning source...
sorting...
converting...
2 Initial add
1 Empty directory added
0 Added file into directory
% manifest of 1
644 a
% manifest of tip
644 a
644 empty/something
% directory renames
tpyo => typo
initializing destination source-hg repository
scanning source...
sorting...
converting...
1 Added directory
0 Oops, typo
% manifest of 0
644 tpyo/something
% manifest of tip
644 typo/something
% nested directory renames
firstlevel/secondlevel => secondlevel
initializing destination source-hg repository
scanning source...
sorting...
converting...
1 Added nested directories
0 Moved secondlevel one level up
% manifest of tip
644 secondlevel/file
644 secondlevel/thirdlevel/stuff
% directory remove
initializing destination source-hg repository
scanning source...
sorting...
converting...
1 Added directory
0 Removed directory
% manifest of 0
644 src/sourcecode
% manifest of tip
% directory replace
first/file => second/file
first => third
initializing destination source-hg repository
scanning source...
sorting...
converting...
1 Initial layout
0 Some conflicting moves
% manifest of tip
644 second/file
644 second/something
644 third/dummy