git-gui: remove warning when deleting correctly merged remote branch

If the user wants to delete a remote branch and selects the correct
"merged into" we should not warn that "Recovering deleted branches is
difficult". For local branches we do the same already.

Signed-off-by: Heiko Voigt <hvoigt@hvoigt.net>
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>

lib/remote_branch_delete.tcl

@@ -208,13 +208,15 @@ method _delete {} {
 		return
 	}
 
-	if {[tk_messageBox \
-		-icon warning \
-		-type yesno \
-		-title [wm title $w] \
-		-parent $w \
-		-message [mc "Recovering deleted branches is difficult.\n\nDelete the selected branches?"]] ne yes} {
-		return
+	if {$checktype ne {head}} {
+		if {[tk_messageBox \
+			-icon warning \
+			-type yesno \
+			-title [wm title $w] \
+			-parent $w \
+			-message [mc "Recovering deleted branches is difficult.\n\nDelete the selected branches?"]] ne yes} {
+			return
+		}
 	}
 
 	destroy $w