gitk: add setting to hide unknown refs

[jobh]

Tools such as branchless (https://github.com/arxanas/git-branchless) add a lot of refs under the "refs/branchless" prefix. By default, these are filtered out from git log using the log.excludeDecoration config directive.

However, gitk applies decoration itself from the output of git show-ref, so these refs clutter up the UI.

This patch adds a setting to gitk to exclude all unknown refs - which is considerably simpler than trying to honour the excludeDecoration pattern. Note that this also hides f.x. the git bisect refs, which I think is fine given that
this behaviour is opt-in (defaults to not hide anything).

[gitgitgadget]

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[Ikke]

/allow

[gitgitgadget]

User jobh is now allowed to use GitGitGadget.

[jobh]

/submit

[gitgitgadget]

Submitted as pull.1619.git.1701695899635.gitgitgadget@gmail.com

To fetch this version into FETCH_HEAD:

git fetch https://github.com/gitgitgadget/git/ pr-1619/jobh/master-v1

To fetch this version to local tag pr-1619/jobh/master-v1:

git fetch --no-tags https://github.com/gitgitgadget/git/ tag pr-1619/jobh/master-v1

[gitgitgadget]

On the Git mailing list, Junio C Hamano wrote (reply to this):

"Joachim B Haga via GitGitGadget" <gitgitgadget@gmail.com> writes:

> This patch adds a setting to gitk to exclude all unknown refs - which
> is considerably simpler than trying to honour the `excludeDecoration`
> pattern.

"This was simpler to implement" is a one-time cost savings for the
developer who added the feature.  For that one-time cost savings,
all the current and future users will pay the price of inconsistent
behaviour between "gitk" and "git log".

It does not look like a good trade-off.