From: Junio C Hamano <gitster@pobox.com>
Date: Mon, 20 Apr 2009 10:58:20 +0000 (-0700)
Subject: checkout branch: prime cache-tree fully
X-Git-Tag: v1.6.2.5~3^2
X-Git-Url: https://git.lorimer.id.au/gitweb.git/diff_plain/83ae209bf9708bf1b67dbac4a3629a0003af5dbb?ds=inline;hp=83ae209bf9708bf1b67dbac4a3629a0003af5dbb

checkout branch: prime cache-tree fully

When switching to another branch, the earlier code relied on incremental
invalidation of cache-tree entries to degrade it.  While it is not wrong
per-se, we know that the resulting index must fully match the branch we
are switching to unless the -m (merge) option is used.

We should simply fully re-prime the cache-tree using the new tree object
in such a case.  And for safety, invalidate the cache-tree as a whole in
other cases.

Signed-off-by: Junio C Hamano <gitster@pobox.com>
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