Modify milestone search keywords to be case insensitive (#20266) (#20498)

* Modify milestone search keywords to be case insensitive (#20266)

Milestone search keywords are now sensitive, this modification is changed to insensitive

* Modify for #18437

Co-authored-by: Lunny Xiao <xiaolunwen@gmail.com>

Author: tyroneyeh

Diff for: models/issues/milestone.go

@@ -15,6 +15,7 @@ import (
 	"code.gitea.io/gitea/modules/setting"
 	api "code.gitea.io/gitea/modules/structs"
 	"code.gitea.io/gitea/modules/timeutil"
+	"code.gitea.io/gitea/modules/util"
 
 	"xorm.io/builder"
 )
@@ -361,7 +362,11 @@ func (opts GetMilestonesOption) toCond() builder.Cond {
 	}
 
 	if len(opts.Name) != 0 {
-		cond = cond.And(builder.Like{"name", opts.Name})
+		if setting.Database.UseSQLite3 {
+			cond = cond.And(builder.Like{"UPPER(name)", util.ToUpperASCII(opts.Name)})
+		} else {
+			cond = cond.And(builder.Like{"UPPER(name)", strings.ToUpper(opts.Name)})
+		}
 	}
 
 	return cond