fix: permissions dont refresh when switching doc

Grid permissions aren't refreshed when switching docs.

Setup permissions like this:

1. Normal perm - read
2. If owner - read + write + others
3. Open a normal doc -> is read only so grid is read only.
4. Now go back and open a created doc -> grid will be read only or empty
   (if no rows)

fix: make grid.perm a computed property that refers to form instead of
duplicating this.

ref: ISS-22-23-01733
(cherry picked from commit 80d264a7b4)

frappe/public/js/frappe/form/controls/table.js

@@ -8,7 +8,6 @@ frappe.ui.form.ControlTable = class ControlTable extends frappe.ui.form.Control
 		this.grid = new Grid({
 			frm: this.frm,
 			df: this.df,
-			perm: this.perm || (this.frm && this.frm.perm) || this.df.perm,
 			parent: this.wrapper,
 			control: this,
 		});

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

@@ -393,11 +393,17 @@ frappe.ui.form.Form = class FrappeForm {
 			this.doc = frappe.get_doc(this.doctype, this.docname);
 
 			// check permissions
+			this.fetch_permissions();
 			if (!this.has_read_permission()) {
 				frappe.show_not_permitted(__(this.doctype) + " " + __(cstr(this.docname)));
 				return;
 			}
 
+			// update grids with new permissions
+			this.grids.forEach((table) => {
+				table.grid.refresh();
+			});
+
 			// read only (workflow)
 			this.read_only = frappe.workflow.is_read_only(this.doctype, this.docname);
 			if (this.read_only) this.set_read_only(true);
@@ -1147,11 +1153,12 @@ frappe.ui.form.Form = class FrappeForm {
 			.attr("target", "_blank");
 	}
 
-	has_read_permission() {
-		// get perm
-		var dt = this.parent_doctype ? this.parent_doctype : this.doctype;
+	fetch_permissions() {
+		let dt = this.parent_doctype ? this.parent_doctype : this.doctype;
 		this.perm = frappe.perm.get_perm(dt, this.doc);
+	}
 
+	has_read_permission() {
 		if (!this.perm[0].read) {
 			return 0;
 		}

frappe/public/js/frappe/form/grid.js

@@ -43,6 +43,14 @@ export default class Grid {
 		this.debounced_refresh = frappe.utils.debounce(this.debounced_refresh, 100);
 	}
 
+	get perm() {
+		return this.control?.perm || this.frm?.perm || this.df.perm;
+	}
+
+	set perm(_perm) {
+		console.error("Setting perm on grid isn't supported, update form's perm instead");
+	}
+
 	allow_on_grid_editing() {
 		if (frappe.utils.is_xs()) {
 			return false;