Fixed #8523 - broken zIndex with global primevue zIndex undefined

Author: tugcekucukoglu

packages/primevue/src/blockui/BlockUI.vue

@@ -70,7 +70,7 @@ export default {
             }
 
             if (this.autoZIndex) {
-                ZIndex.set('modal', this.mask, this.baseZIndex + this.$primevue.config.zIndex.modal);
+                ZIndex.set('modal', this.mask, this.baseZIndex || this.$primevue.config.zIndex.modal);
             }
 
             this.isBlocked = true;

packages/primevue/src/colorpicker/ColorPicker.vue

@@ -358,7 +358,7 @@ export default {
             this.bindResizeListener();
 
             if (this.autoZIndex) {
-                ZIndex.set('overlay', el, this.baseZIndex + this.$primevue.config.zIndex.overlay);
+                ZIndex.set('overlay', el, this.baseZIndex || this.$primevue.config.zIndex.overlay);
             }
 
             // Issue: #7508

packages/primevue/src/contextmenu/ContextMenu.vue

@@ -363,7 +363,7 @@ export default {
             this.position();
 
             if (this.autoZIndex) {
-                ZIndex.set('menu', el, this.baseZIndex + this.$primevue.config.zIndex.menu);
+                ZIndex.set('menu', el, this.baseZIndex || this.$primevue.config.zIndex.menu);
             }
         },
         onAfterEnter() {

packages/primevue/src/dialog/Dialog.vue

@@ -145,7 +145,7 @@ export default {
             this.bindGlobalListeners();
 
             if (this.autoZIndex) {
-                ZIndex.set('modal', this.mask, this.baseZIndex + this.$primevue.config.zIndex.modal);
+                ZIndex.set('modal', this.mask, this.baseZIndex || this.$primevue.config.zIndex.modal);
             }
         },
         onAfterEnter() {

packages/primevue/src/menu/Menu.vue

@@ -267,7 +267,7 @@ export default {
             this.bindScrollListener();
 
             if (this.autoZIndex) {
-                ZIndex.set('menu', el, this.baseZIndex + this.$primevue.config.zIndex.menu);
+                ZIndex.set('menu', el, this.baseZIndex || this.$primevue.config.zIndex.menu);
             }
 
             if (this.popup) {

packages/primevue/src/popover/Popover.vue

@@ -116,7 +116,7 @@ export default {
             this.bindResizeListener();
 
             if (this.autoZIndex) {
-                ZIndex.set('overlay', el, this.baseZIndex + this.$primevue.config.zIndex.overlay);
+                ZIndex.set('overlay', el, this.baseZIndex || this.$primevue.config.zIndex.overlay);
             }
 
             this.overlayEventListener = (e) => {

packages/primevue/src/tieredmenu/TieredMenu.vue

@@ -416,7 +416,7 @@ export default {
         },
         onEnter(el) {
             if (this.autoZIndex) {
-                ZIndex.set('menu', el, this.baseZIndex + this.$primevue.config.zIndex.menu);
+                ZIndex.set('menu', el, this.baseZIndex || this.$primevue.config.zIndex.menu);
             }
 
             addStyle(el, { position: 'absolute', top: '0' });