Added deep equality check for link url change

Author: NogaMan

package-lock.json

@@ -24,7 +24,10 @@
   "ngPackage": {
     "lib": {
       "entryFile": "public_api.ts"
-    }
+    },
+    "whitelistedNonPeerDependencies": [
+      "fast-deep-equal"
+    ]
   },
   "repository": {
     "type": "git",
@@ -52,5 +55,8 @@
     "prettier": "^1.15.3",
     "rxjs": "^6.5.3",
     "typescript": "^4.1.0"
+  },
+  "dependencies": {
+    "fast-deep-equal": "^3.1.3"
   }
 }

package.json

@@ -9,6 +9,7 @@ import {
   SimpleChanges
 } from '@angular/core';
 import { RouterLink, RouterLinkWithHref } from '@angular/router';
+import * as isEqual from 'fast-deep-equal';
 import { LinkHandler } from './link-handler.service';
 import { LinkHandlerStrategy } from './link-handler-strategy';
 
@@ -34,7 +35,7 @@ export class LinkDirective implements OnChanges, OnDestroy {
   }
 
   ngOnChanges(c: SimpleChanges) {
-    if (c.routerLink) {
+    if (c.routerLink && !isEqual(c.routerLink.currentValue, c.routerLink.previousValue)) {
       this.linkHandler.unregister(this);
       this.linkHandler.register(this);
     }