Добавил правильный on-resize

client/components/App.vue

@@ -103,6 +103,9 @@ class App extends Vue {
         document.addEventListener('keydown', (event) => {
             this.keyHook(event);
         });        
+        window.addEventListener('resize', () => {
+            this.$root.$emit('resize');
+        });
     }
 
     mounted() {

client/components/Reader/Reader.vue

@@ -173,6 +173,7 @@ class Reader extends Vue {
 
     toolBarToggle() {
         this.commit('reader/setToolBarActive', !this.toolBarActive);
+        this.$root.$emit('resize');
     }
 
     buttonClick(button) {

client/components/Reader/TextPage/TextPage.vue

@@ -38,9 +38,7 @@ class TextPage extends Vue {
             this.$emit('book-pos-changed', {bookPos: newValue});
         }, 100);
 
-        window.addEventListener('resize', () => {
-            this.onResize();
-        });
+        this.$root.$on('resize', () => {this.$nextTick(this.onResize)});
     }
 
     mounted() {