mergetools: don't let meld open all changed files on startup In meld 3.16, a multi-file change with option '-a' results in an overview list being opened. In meld 3.20, a multi-file change with option '-a' results in an overview list AND every changed file being opened. Simply removing '-a' seems to work fine for both cases and also behaves the same as before for single-file changes. As per the release notes, this is due to the following change in meld 3.19.0: "Make the --auto-compare command line flag work again (Kai Willadsen)" See also https://gitlab.gnome.org/GNOME/meld/-/issues/516

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Our full contribution guidelines are in our wiki, please see:

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https://www.mercurial-scm.org/wiki/ContributingChanges

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If you just want a checklist to follow, you can go straight to

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https://www.mercurial-scm.org/wiki/ContributingChanges#Submission_checklist

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If you can't run the entire testsuite for some reason (it can be

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difficult on Windows), please at least run `contrib/check-code.py` on

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any files you've modified and run `python contrib/check-commit` on any

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commits you've made (for example, `python contrib/check-commit

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273ce12ad8f1` will report some style violations on a very old commit).