Tag contents, once read, are forever cached in memory.
This makes gitk unable to notice when tag contents change.

Allow users to cause a reload of the tag contents by using
the "File->Reread references" action.

Reported-by: Tim McCormack <cor...@brainonfire.net>
Suggested-by: Junio C Hamano <gits...@pobox.com>
Signed-off-by: David Aguilar <dav...@gmail.com>
 gitk |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)

diff --git a/gitk b/gitk
index 9bba9aa..a124822 100755
--- a/gitk
+++ b/gitk
@@ -10599,7 +10599,7 @@ proc movedhead {hid head} {
 proc changedrefs {} {
-    global cached_dheads cached_dtags cached_atags
+    global cached_dheads cached_dtags cached_atags tagcontents
     global arctags archeads arcnos arcout idheads idtags
     foreach id [concat [array names idheads] [array names idtags]] {
@@ -10611,6 +10611,7 @@ proc changedrefs {} {
+    catch {unset tagcontents}
     catch {unset cached_dtags}
     catch {unset cached_atags}
     catch {unset cached_dheads}

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