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[PATCH 2/2] __git_recent_branches: Remove erroneous parsing of partial ref names as tags.

In the reflog, partial ref names in the "from" field always represent names of
heads.  (That is not true for the "to" field.)  The parsing of tag names was
added in commit 39102 (317c96b64f43688a6be08a8b1c93b6ab4eed662c) for equivalence
with the then-previous implementation which used `git log $partial_ref_name`.
The equivalence was correct, however, the then-previous implementation was not,
since it would consider $partial_ref_name as a refs/tags/ name if a refs/heads/
name did not exist.
 Completion/Unix/Command/_git | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/Completion/Unix/Command/_git b/Completion/Unix/Command/_git
index 94457fc..4dba93b 100644
--- a/Completion/Unix/Command/_git
+++ b/Completion/Unix/Command/_git
@@ -6079,7 +6079,7 @@ __git_recent_branches() {
   local -a branches
   local -A descriptions
   local -a reply
-  local -aU valid_ref_names_munged=( ${"${(f)"$(_call_program valid-ref-names 'git for-each-ref --format="%(refname)" refs/heads/ refs/tags/')"}"#refs/(heads|tags)/} )
+  local -aU valid_ref_names_munged=( ${"${(f)"$(_call_program valid-ref-names 'git for-each-ref --format="%(refname)" refs/heads/')"}"#refs/heads/} )
   # 1. Obtain names of recently-checked-out branches from the reflog.
   # 2. Remove ref names that that no longer exist from the list.
@@ -6096,13 +6096,13 @@ __git_recent_branches() {
   # 4. Obtain log messages for all of them in one shot.
   # TODO: we'd really like --sort=none here...  but git doesn't support such a thing.
   # The \n removal is because for-each-ref prints a \n after each entry.
-  descriptions=( ${(0)"$(_call_program all-descriptions "git --no-pager for-each-ref --format='%(refname)%00%(subject)%00'" refs/heads/${(q)^branches} refs/tags/${(q)^branches} "--")"//$'\n'} )
+  descriptions=( ${(0)"$(_call_program all-descriptions "git --no-pager for-each-ref --format='%(refname)%00%(subject)%00'" refs/heads/${(q)^branches} "--")"//$'\n'} )
   # 5. Synthesize the data structure _describe wants.
   local -a branches_colon_descriptions
   local branch
   for branch in ${branches} ; do
-    branches_colon_descriptions+="${branch//:/\:}:${(v)descriptions[(I)(refs/heads/|refs/tags/)${(b)branch}]}"
+    branches_colon_descriptions+="${branch//:/\:}:${descriptions[refs/heads/${(b)branch}]}"
   _describe -V -t recent-branches "recent branches" branches_colon_descriptions

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