Fix focusing IV content.

Telegram/Resources/iv_html/page.css

@@ -135,6 +135,9 @@ html.custom_scroll ::-webkit-scrollbar-thumb:hover {
 	overflow-x: hidden;
 	overflow-y: auto;
 }
+.page-scroll:focus {
+	outline: none;
+}
 .page-slide {
 	position: relative;
 	width: 100%;

Telegram/Resources/iv_html/page.js

@@ -79,10 +79,14 @@ var IV = {
 			});
 		} else if (e.key === 'Escape' || e.keyCode === 27) {
 			e.preventDefault();
-			IV.notify({
-				event: 'keydown',
-				key: 'escape',
-			});
+			if (IV.position) {
+				window.history.back();
+			} else {
+				IV.notify({
+					event: 'keydown',
+					key: 'escape',
+				});
+			}
 		}
 	},
 	frameMouseEnter: function (e) {
@@ -250,6 +254,8 @@ var IV = {
 		}
 		IV.initMedia();
 		IV.notify({ event: 'ready' });
+
+		IV.forceScrollFocus();
 	},
 	initMedia: function () {
 		const photos = document.getElementsByClassName('photo');
@@ -356,6 +362,7 @@ var IV = {
 			var data = JSON.parse(IV.cache[index].content);
 			var el = document.createElement('div');
 			el.className = 'page-scroll';
+			el.tabIndex = '-1';
 			el.innerHTML = '<div class="page-slide"><article>'
 				+ data.html
 				+ '</article></div>';
@@ -370,6 +377,7 @@ var IV = {
 		IV.pending = null;
 		if (IV.index == index) {
 			IV.jumpToHash(hash, IV.mac);
+			IV.forceScrollFocus();
 			return;
 		}
 		window.history.replaceState(IV.computeCurrentState(), '');
@@ -452,6 +460,15 @@ var IV = {
 		} else {
 			IV.jumpToHash(hash, IV.mac);
 		}
+
+		IV.forceScrollFocus();
+	},
+	forceScrollFocus: function () {
+		IV.findPageScroll().focus();
+		setTimeout(function () {
+			// Doesn't work on #hash-ed pages in Windows WebView2 otherwise.
+			IV.findPageScroll().focus();
+		}, 100);
 	},
 	back: function () {
         window.history.back();
@@ -467,9 +484,9 @@ document.onkeydown = IV.frameKeyDown;
 document.onmouseenter = IV.frameMouseEnter;
 document.onmouseup = IV.frameMouseUp;
 window.onmessage = IV.postMessageHandler;
-
 window.addEventListener('popstate', function (e) {
 	if (e.state) {
 		IV.showDOM(e.state.index, e.state.hash, e.state.scroll);
 	}
 });
+document.addEventListener("DOMContentLoaded", IV.forceScrollFocus);

Telegram/SourceFiles/iv/iv_controller.cpp

@@ -9,6 +9,7 @@ https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
 
 #include "base/platform/base_platform_info.h"
 #include "base/invoke_queued.h"
+#include "base/qt_signal_producer.h"
 #include "iv/iv_data.h"
 #include "lang/lang_keys.h"
 #include "ui/platform/ui_platform_window_title.h"
@@ -31,6 +32,7 @@ https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
 #include <QtCore/QJsonValue>
 #include <QtCore/QFile>
 #include <QtGui/QPainter>
+#include <QtGui/QWindow>
 #include <charconv>
 
 namespace Iv {
@@ -182,7 +184,7 @@ namespace {
 				<path d="M14.9972363,18 L9.13865768,12.1414214 C9.06055283,12.0633165 9.06055283,11.9366835 9.13865768,11.8585786 L14.9972363,6 L14.9972363,6" transform="translate(11.997236, 12.000000) scale(-1, -1) rotate(-90.000000) translate(-11.997236, -12.000000) "></path>
 			</svg>
 		</button>
-		<div class="page-scroll"><div class="page-slide">
+		<div class="page-scroll" tabindex="-1"><div class="page-slide">
 			<article)"_q + contentAttributes + ">"_q + page.content + R"(</article>
 		</div></div>
 		<script>)"_q + js + R"(</script>
@@ -286,6 +288,15 @@ void Controller::createWindow() {
 	_window->setTitleStyle(st::ivTitle);
 	const auto window = _window.get();
 
+	base::qt_signal_producer(
+		window->window()->windowHandle(),
+		&QWindow::activeChanged
+	) | rpl::filter([=] {
+		return _webview && window->window()->windowHandle()->isActive();
+	}) | rpl::start_with_next([=] {
+		_webview->focus();
+	}, window->lifetime());
+
 	_title = std::make_unique<Ui::RpWidget>(window);
 	_title->setAttribute(Qt::WA_TransparentForMouseEvents);
 	_title->paintRequest() | rpl::start_with_next([=](QRect clip) {
@@ -521,6 +532,7 @@ void Controller::showInWindow(const QString &dataPath, Prepared page) {
 				id += '#' + hash;
 			}
 			_webview->navigateToData(id);
+			_webview->focus();
 		} else {
 			_events.fire({ Event::Type::Close });
 		}
@@ -529,12 +541,14 @@ void Controller::showInWindow(const QString &dataPath, Prepared page) {
 		_window->raise();
 		_window->activateWindow();
 		_window->setFocus();
+		_webview->focus();
 	} else {
 		_navigateToIndexWhenReady = index;
 		_navigateToHashWhenReady = hash;
 		_window->raise();
 		_window->activateWindow();
 		_window->setFocus();
+		_webview->focus();
 	}
 }