patch 8.1.0644: finding next sign ID is inefficientv8.1.0644

Problem:    Finding next sign ID is inefficient.
Solution:   Add next_sign_id. (Yegappan Lakshmanan, closes #3717)

1 files changed, 1 insertions, 0 deletions

diff --git a/src/structs.h b/src/structs.h
index aa59bff245..ae1c12e810 100644
--- a/src/structs.h
+++ b/src/structs.h
@@ -737,6 +737,7 @@ typedef struct proptype_S
 typedef struct signgroup_S
 {
     short_u	refcount;		// number of signs in this group
+    int		next_sign_id;		// next sign id for this group
     char_u	sg_name[1];		// sign group name
 } signgroup_T;