From e6937eed15096162aa9496505ce84a0dd192c679 Mon Sep 17 00:00:00 2001
From: John Factotum <50942278+johnfactotum@users.noreply.github.com>
Date: Sun, 15 Sep 2024 13:10:14 +0800
Subject: [PATCH] Paginator: fix focus lost when loading new section

Also add method for setting focus on the content window
---
 paginator.js | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/paginator.js b/paginator.js
index d53bc4d..8668922 100644
--- a/paginator.js
+++ b/paginator.js
@@ -866,6 +866,7 @@ export class Paginator extends HTMLElement {
     async #display(promise) {
         const { index, src, anchor, onLoad, select } = await promise
         this.#index = index
+        const hasFocus = this.#view?.document?.hasFocus()
         if (src) {
             const view = this.#createView()
             const afterLoad = doc => {
@@ -890,6 +891,7 @@ export class Paginator extends HTMLElement {
         }
         await this.scrollToAnchor((typeof anchor === 'function'
             ? anchor(this.#view.document) : anchor) ?? 0, select)
+        if (hasFocus) this.focusView()
     }
     #canGoToIndex(index) {
         return index >= 0 && index <= this.sections.length - 1
@@ -1006,6 +1008,9 @@ export class Paginator extends HTMLElement {
         // needed because the resize observer doesn't work in Firefox
         this.#view?.document?.fonts?.ready?.then(() => this.#view.expand())
     }
+    focusView() {
+        this.#view.document.defaultView.focus()
+    }
     destroy() {
         this.#observer.unobserve(this)
         this.#view.destroy()