Add a tooltip with information about the dice.

Telegram/Resources/langs/lang.strings

@@ -1329,6 +1329,8 @@ https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
 "lng_dialogs_skip_archive_in_search" = "Skip results from archive";
 "lng_dialogs_show_archive_in_search" = "With results from archive";
 
+"lng_about_dice" = "Send a 🎲 emoji to any chat to get a random number from Telegram.";
+
 "lng_open_this_link" = "Open this link?";
 "lng_open_link" = "Open";
 "lng_allow_bot_pass" = "Allow {bot_name} to pass your Telegram name and ID to the web pages you open via this bot?";

Telegram/SourceFiles/history/view/media/history_view_dice.cpp

@@ -13,6 +13,8 @@ https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
 #include "history/history_item.h"
 #include "history/history_item_components.h"
 #include "history/view/history_view_element.h"
+#include "ui/toast/toast.h"
+#include "lang/lang_keys.h"
 #include "main/main_session.h"
 
 namespace HistoryView {
@@ -42,6 +44,20 @@ QSize Dice::size() {
 	return _start.size();
 }
 
+ClickHandlerPtr Dice::link() {
+	if (_parent->data()->Has<HistoryMessageForwarded>()) {
+		return nullptr;
+	}
+	static auto kHandler = std::make_shared<LambdaClickHandler>([] {
+		auto config = Ui::Toast::Config();
+		config.multiline = true;
+		config.minWidth = st::msgMinWidth;
+		config.text = tr::lng_about_dice(tr::now);
+		Ui::Toast::Show(config);
+	});
+	return kHandler;
+}
+
 void Dice::draw(Painter &p, const QRect &r, bool selected) {
 	if (const auto value = _end ? 0 : _dice->diceValue()) {
 		if (const auto document = Lookup(_parent, value)) {

Telegram/SourceFiles/history/view/media/history_view_dice.h

@@ -24,6 +24,8 @@ public:
 	QSize size() override;
 	void draw(Painter &p, const QRect &r, bool selected) override;
 
+	ClickHandlerPtr link() override;
+
 	void clearStickerLoopPlayed() override {
 	}
 	void unloadHeavyPart() override {