Simplify hash change click handler (#3975)

* first try

* second try

* try 3

* try 4

* encapsulate page store update logic inside renderer

* changeset

Co-authored-by: Rich Harris <hello@rich-harris.dev>

.changeset/sharp-olives-sparkle.md

@@ -0,0 +1,5 @@
+---
+'@sveltejs/kit': patch
+---
+
+Update page store without rerunning load when hash changes

packages/kit/src/runtime/client/renderer.js

@@ -395,6 +395,10 @@ export class Renderer {
 		this.autoscroll = true;
 		this.updating = false;
 
+		if (navigation_result.props.page) {
+			this.page = navigation_result.props.page;
+		}
+
 		if (!this.router) return;
 
 		const leaf_node = navigation_result.state.branch[navigation_result.state.branch.length - 1];
@@ -432,13 +436,21 @@ export class Renderer {
 		return this.invalidating;
 	}
 
+	/** @param {URL} url */
+	update_page_store(url) {
+		this.stores.page.set({ ...this.page, url });
+		this.stores.page.notify();
+	}
+
 	/** @param {import('./types').NavigationResult} result */
 	_init(result) {
 		this.current = result.state;
 
 		const style = document.querySelector('style[data-svelte]');
 		if (style) style.remove();
 
+		this.page = result.props.page;
+
 		this.root = new this.Root({
 			target: this.target,
 			props: {

packages/kit/src/runtime/client/router.js

@@ -203,11 +203,8 @@ export class Router {
 				this.hash_navigating = true;
 
 				this.#update_scroll_positions();
+				this.renderer.update_page_store(new URL(url.href));
 
-				const info = this.parse(url);
-				if (info) {
-					return this.renderer.update(info, [], false);
-				}
 				return;
 			}