Add one more clap cosmetic argument nameclap-bug-maybe

However, for an unidentified reason, adding this one causes the short
help to switch from one-line-per-option to a multiple-lines-per-option
format.

1 files changed, 2 insertions, 1 deletions

diff --git a/src/cli.rs b/src/cli.rs
index 1a7ba767..b1a1dc72 100644
--- a/src/cli.rs
+++ b/src/cli.rs
@@ -752,7 +752,8 @@ pub struct Opt {
 
     #[clap(
         long = "merge-conflict-theirs-diff-header-decoration-style",
-        default_value = "box"
+        default_value = "box",
+        value_name = "STYLE_STRING"
     )]
     /// Style string for the decoration of the header above the 'theirs' merge conflict diff.
     ///