[fix] comment paging and count (#4459)

frappe/desk/form/load.py

@@ -94,6 +94,7 @@ def get_docinfo(doc=None, doctype=None, name=None):
 	frappe.response["docinfo"] = {
 		"attachments": get_attachments(doc.doctype, doc.name),
 		"communications": _get_communications(doc.doctype, doc.name),
+		'total_comments': len(json.loads(doc.get('_comments') or '[]')),
 		'versions': get_versions(doc),
 		"assignments": get_assignments(doc.doctype, doc.name),
 		"permissions": get_doc_permissions(doc),

frappe/public/js/frappe/form/footer/timeline.js

@@ -51,6 +51,10 @@ frappe.ui.form.Timeline = Class.extend({
 							var communications = me.get_communications().concat(new_communications);
 							frappe.model.set_docinfo(me.frm.doc.doctype, me.frm.doc.name, "communications", communications);
 
+							if (new_communications.length < 20) {
+								me.more = false;
+							}
+
 						} else {
 							me.more = false;
 						}

frappe/public/js/frappe/form/form_sidebar.js

@@ -70,10 +70,10 @@ frappe.ui.form.Sidebar = Class.extend({
 	},
 
 	refresh_comments: function() {
-		var comments = $.map(this.frm.timeline.get_communications(), function(c) {
+		$.map(this.frm.timeline.get_communications(), function(c) {
 			return (c.communication_type==="Communication" || (c.communication_type=="Comment" && c.comment_type==="Comment")) ? c : null;
 		});
-		this.comments.find(".n-comments").html(comments.length);
+		this.comments.find(".n-comments").html(this.frm.get_docinfo().total_comments);
 	},
 
 	make_tags: function() {