fix(tinymce): set absolute path for skin url (#5491)

src/app/@theme/components/tiny-mce/tiny-mce.component.ts

@@ -0,0 +1,37 @@
+import { Component, OnDestroy, AfterViewInit, Output, EventEmitter, ElementRef } from '@angular/core';
+import { LocationStrategy } from '@angular/common';
+
+@Component({
+  selector: 'ngx-tiny-mce',
+  template: '',
+})
+export class TinyMCEComponent implements OnDestroy, AfterViewInit {
+
+  @Output() editorKeyup = new EventEmitter<any>();
+
+  editor: any;
+
+  constructor(
+    private host: ElementRef,
+    private locationStrategy: LocationStrategy,
+  ) { }
+
+  ngAfterViewInit() {
+    tinymce.init({
+      target: this.host.nativeElement,
+      plugins: ['link', 'paste', 'table'],
+      skin_url: `${this.locationStrategy.getBaseHref()}assets/skins/lightgray`,
+      setup: editor => {
+        this.editor = editor;
+        editor.on('keyup', () => {
+          this.editorKeyup.emit(editor.getContent());
+        });
+      },
+      height: '320',
+    });
+  }
+
+  ngOnDestroy() {
+    tinymce.remove(this.editor);
+  }
+}