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[PATCH] _git: Use associative array for third-party completion

When loading completion for third-party git commands use an associative
array to track if something has been loaded rather than a normal array.

I started looking into this after I added a `_git-f` file to my function
path while having `$f` defined as a variable I started getting `bad math
expression: operand expected` the first time I used git completion. The
line number referenced by that error pointed at where this was
apparently trying to see if there was already an entry in
`$_git_third_party_commands`. Unless I'm completely missing something
that wouldn't work as it was written. Since this section of the code is
trying to keep track of command names and an associated description an
associative array seems like a much better option. When later copying
this into `$third_party_commands` I've left that as a normal array.
 Completion/Unix/Command/_git | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/Completion/Unix/Command/_git b/Completion/Unix/Command/_git
index 04b5677ce..cecb80ac3 100644
--- a/Completion/Unix/Command/_git
+++ b/Completion/Unix/Command/_git
@@ -6267,8 +6267,8 @@ _git_commands () {
   zstyle -a :completion:$curcontext: user-commands user_commands
   local command
-  for command in $_git_third_party_commands; do
-    (( $+commands[git-${command%%:*}] )) && third_party_commands+=$command
+  for command in ${(k)_git_third_party_commands}; do
+    (( $+commands[git-${command}] )) && third_party_commands+=$command$_git_third_party_commands[$command]
   local -a aliases
@@ -8475,7 +8475,7 @@ _git() {
 # Load any _git-* definitions so that they may be completed as commands.
-declare -gUa _git_third_party_commands
+declare -gA _git_third_party_commands
 local file input
@@ -8497,7 +8497,7 @@ for file in ${^fpath}/_git-*~(*~|*.zwc)(-.N); do
     (( i++ ))
   done < $file
-  _git_third_party_commands+=$name$desc
+  _git_third_party_commands+=([$name]=$desc)

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