init

user/plugins/admin/themes/grav/app/utils/tabs-memory.js

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+import $ from 'jquery';
+import Cookies from '../utils/cookies';
+import { Instance as Editors } from '../forms/fields/editor';
+
+let Data = JSON.parse(Cookies.get('grav-tabs-state') || '{}');
+
+$('body').on('touchstart click', '[data-tabid]', (event) => {
+    event && event.stopPropagation();
+    let target = $(event.currentTarget);
+
+    Data[target.data('tabkey')] = target.data('scope');
+    Cookies.set('grav-tabs-state', JSON.stringify(Data), { expires: Infinity });
+
+    const panel = $(`[id="${target.data('tabid')}"]`);
+
+    target.siblings('[data-tabid]').removeClass('active');
+    target.addClass('active');
+
+    panel.siblings('[id]').removeClass('active');
+    panel.addClass('active');
+
+    Editors.editors.each((index, editor) => {
+        let codemirror = $(editor).data('codemirror');
+        if (!codemirror) { return; }
+        if (codemirror.display.lastWrapWidth === 0) {
+            codemirror.refresh();
+        }
+    });
+});