Show IV button only if supported.

Telegram/SourceFiles/data/data_web_page.cpp

@@ -172,7 +172,7 @@ WebPageType ParseWebPageType(
 }
 
 bool IgnoreIv(WebPageType type) {
-	return (type == WebPageType::Message);
+	return !Iv::ShowButton() || (type == WebPageType::Message);
 }
 
 WebPageType ParseWebPageType(const MTPDwebPage &page) {

Telegram/SourceFiles/iv/iv_data.cpp

@@ -8,11 +8,17 @@ https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
 #include "iv/iv_data.h"
 
 #include "iv/iv_prepare.h"
+#include "webview/webview_interface.h"
 
 #include <QtCore/QRegularExpression>
 #include <QtCore/QUrl>
 
 namespace Iv {
+namespace {
+
+bool FailureRecorded/* = false*/;
+
+} // namespace
 
 QByteArray GeoPointId(Geo point) {
 	const auto lat = int(point.lat * 1000000);
@@ -89,4 +95,17 @@ QString SiteNameFromUrl(const QString &url) {
 	return QString();
 }
 
+bool ShowButton() {
+	static const auto Supported = Webview::NavigateToDataSupported();
+	return Supported;
+}
+
+void RecordShowFailure() {
+	FailureRecorded = true;
+}
+
+bool FailedToShow() {
+	return FailureRecorded;
+}
+
 } // namespace Iv

Telegram/SourceFiles/iv/iv_data.h

@@ -53,4 +53,9 @@ private:
 
 [[nodiscard]] QString SiteNameFromUrl(const QString &url);
 
+[[nodiscard]] bool ShowButton();
+
+void RecordShowFailure();
+[[nodiscard]] bool FailedToShow();
+
 } // namespace Iv

Telegram/SourceFiles/ui/chat/chat.style

@@ -1060,4 +1060,4 @@ boostsMessageIcon: icon {{ "stories/boosts_mini", windowFg }};
 boostsMessageIconPadding: margins(0px, 2px, 0px, 0px);
 
 historyIvIcon: icon{{ "boosts/boost_mini2", windowFg }};
-historyIvIconPadding: margins(2px, 3px, 2px, 0px);
+historyIvIconPadding: margins(2px, 2px, 2px, 0px);

Telegram/lib_webview

@@ -1 +1 @@
-Subproject commit fbf9dd54787df90c98cf230cb53323527e0b0639
+Subproject commit cf8ef94d0b12f8484e247d6a2d88dd1c11a6b964