feat: add option to set default email recipients (#25555)

* feat: add option to set default email recipients

* fix: don't crash if no events

communication.js:206 Uncaught TypeError: Cannot read properties of undefined (reading 'events')
    at frappe.views.CommunicationComposer.get_default_recipients (communication.js:206:16)
    at frappe.views.CommunicationComposer.get_fields (communication.js:57:19)
    at frappe.views.CommunicationComposer.make (communication.js:25:17)
    at new frappe.views.CommunicationComposer (communication.js:16:8)
    at Object.primary_action (communication__list_js:34:3)
    at HTMLButtonElement.<anonymous> (list_view.js:1432:19)
    at HTMLButtonElement.dispatch (jquery.js:5135:27)
    at elemData.handle (jquery.js:4939:28)

Signed-off-by: Akhil Narang <me@akhilnarang.dev>

---------

Signed-off-by: Akhil Narang <me@akhilnarang.dev>
Co-authored-by: Akhil Narang <me@akhilnarang.dev>

frappe/public/js/frappe/views/communication.js

@@ -54,6 +54,7 @@ frappe.views.CommunicationComposer = class {
 				fieldtype: "MultiSelect",
 				reqd: 0,
 				fieldname: "recipients",
+				default: this.get_default_recipients("recipients"),
 			},
 			{
 				fieldtype: "Button",
@@ -72,11 +73,13 @@ frappe.views.CommunicationComposer = class {
 				label: __("CC"),
 				fieldtype: "MultiSelect",
 				fieldname: "cc",
+				default: this.get_default_recipients("cc"),
 			},
 			{
 				label: __("BCC"),
 				fieldtype: "MultiSelect",
 				fieldname: "bcc",
+				default: this.get_default_recipients("bcc"),
 			},
 			{
 				label: __("Schedule Send At"),
@@ -199,6 +202,14 @@ frappe.views.CommunicationComposer = class {
 		return fields;
 	}
 
+	get_default_recipients(fieldname) {
+		if (this.frm?.events.get_email_recipients) {
+			return (this.frm.events.get_email_recipients(this.frm, fieldname) || []).join(", ");
+		} else {
+			return "";
+		}
+	}
+
 	guess_language() {
 		// when attach print for print format changes try to guess language
 		// if print format has language then set that else boot lang.