[PATCH v2 08/11] git-gui: use HEAD as current branch when detached (bug fix)

[Mark Levedahl <mlevedahl@gmail.com>]

commit f87a36b697 ("git-gui: use git-branch --show-current", 2024-02-12)
changed git-gui to use git-branch to access refs, rather than directly
reading files as doing the latter is not compatible with the reftable
backend. git branch --show-current reports an empty branch name when the
head is detached, and in this case load_current_branch needs to report
HEAD using special case logic as it did prior to the above commit. Make
it do so.

This addresses an issue with git-gui browser failing with a detached
head.

Signed-off-by: Mark Levedahl <mlevedahl@gmail.com>
---
 git-gui.sh | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/git-gui.sh b/git-gui.sh
index aeb7ed3548..a72d8a59ec 100755
--- a/git-gui.sh
+++ b/git-gui.sh
@@ -648,6 +648,9 @@ proc load_current_branch {} {
 
 	set current_branch [git branch --show-current]
 	set is_detached [expr [string length $current_branch] == 0]
+	if {$is_detached} {
+		set current_branch {HEAD}
+	}
 }
 
 auto_load tk_optionMenu
-- 
2.54.0.99.14