fix(Issue): track issue split from (#18995)

* fix: track issue split from

* fix: comment on issue split

* Update issue.py

erpnext/support/doctype/issue/issue.py

@@ -87,6 +87,7 @@ class Issue(Document):
 		from copy import deepcopy
 		replicated_issue = deepcopy(self)
 		replicated_issue.subject = subject
+		replicated_issue.issue_split_from = self.name
 		frappe.get_doc(replicated_issue).insert()
 		# Replicate linked Communications
 		# todo get all communications in timeline before this, and modify them to append them to new doc
@@ -96,6 +97,15 @@ class Issue(Document):
 			doc = frappe.get_doc("Communication", communication.name)
 			doc.reference_name = replicated_issue.name
 			doc.save(ignore_permissions=True)
+
+		frappe.get_doc({
+			"doctype": "Comment",
+			"comment_type": "Info",
+			"reference_doctype": "Issue",
+			"reference_name": replicated_issue.name,
+			"content": " - Split the Issue from <a href='#Form/Issue/{0}'>{1}</a>".format(self.name, frappe.bold(self.name))
+		}).insert(ignore_permissions=True)
+
 		return replicated_issue.name
 
 def get_list_context(context=None):
@@ -177,4 +187,4 @@ def make_issue_from_communication(communication, ignore_communication_links=Fals
 
 	link_communication_to_document(doc, "Issue", issue.name, ignore_communication_links)
 
-	return issue.name
+	return issue.name