[Improvement] Mention user from context menu

Telegram/Resources/langs/rewrites/en.json

@@ -133,6 +133,7 @@
 	"ktg_forward_subtitle_uncaptioned": "uncaptioned",
 	"ktg_forward_subtitle_group_all_media": "as albums",
 	"ktg_forward_subtitle_separate_messages": "one by one",
+	"ktg_profile_mention_user": "Mention user",
 	"ktg_filters_exclude_not_owned": "Not owned",
 	"ktg_filters_exclude_not_admin": "Not administrated",
 	"ktg_filters_exclude_owned": "Owned",

Telegram/SourceFiles/boxes/peers/edit_participants_box.cpp

@@ -1647,6 +1647,14 @@ base::unique_qptr<Ui::PopupMenu> ParticipantsBoxController::rowContextMenu(
 							: Dialogs::Key(),
 							user);
 				}), &st::menuIconSearch);
+			if (const auto openedPeer = mainwidget->peer()) {
+				if (Data::CanSendTexts(openedPeer) && participant->isUser()) {
+					result->addAction(
+						ktr("ktg_profile_mention_user"),
+						crl::guard(this, [=] { mainwidget->mentionUser(user); }),
+						&st::menuIconMention);
+				}
+			}
 		}
 	}
 	if (const auto by = _additional.restrictedBy(participant)) {

Telegram/SourceFiles/history/history_widget.cpp

@@ -7642,6 +7642,25 @@ bool HistoryWidget::sendExistingPhoto(
 	return true;
 }
 
+void HistoryWidget::mentionUser(PeerData *peer) {
+	if (!peer || !peer->isUser()) {
+		return;
+	}
+
+	const auto user = peer->asUser();
+	QString replacement, entityTag;
+	if (user->username.isEmpty()) {
+		replacement = user->firstName;
+		if (replacement.isEmpty()) {
+			replacement = user->name;
+		}
+		entityTag = PrepareMentionTag(user);
+	} else {
+		replacement = '@' + user->username;
+	}
+	_field->insertTag(replacement, entityTag);
+}
+
 void HistoryWidget::showInfoTooltip(
 		const TextWithEntities &text,
 		Fn<void()> hiddenCallback) {

Telegram/SourceFiles/history/history_widget.h

@@ -277,6 +277,8 @@ public:
 		not_null<PhotoData*> photo,
 		Api::SendOptions options);
 
+	void mentionUser(PeerData *peer);
+
 	void showInfoTooltip(
 		const TextWithEntities &text,
 		Fn<void()> hiddenCallback);

Telegram/SourceFiles/mainwidget.cpp

@@ -2796,6 +2796,14 @@ int MainWidget::backgroundFromY() const {
 	return -getMainSectionTop();
 }
 
+void MainWidget::mentionUser(PeerData *peer) {
+	if (!_history->peer() || !_history->peer()->canWrite()) {
+		return;
+	}
+
+	_history->mentionUser(peer);
+}
+
 bool MainWidget::contentOverlapped(const QRect &globalRect) {
 	return _history->contentOverlapped(globalRect)
 		|| _playerPlaylist->overlaps(globalRect);

Telegram/SourceFiles/mainwidget.h

@@ -202,6 +202,8 @@ public:
 
 	bool contentOverlapped(const QRect &globalRect);
 
+	void mentionUser(PeerData *peer);
+
 	void showChooseReportMessages(
 		not_null<PeerData*> peer,
 		Ui::ReportReason reason,

Telegram/SourceFiles/ui/menu_icons.style

@@ -80,6 +80,7 @@ menuIconPersonal: icon {{ "menu/personal", menuIconColor }};
 menuIconPorn: icon {{ "menu/porn", menuIconColor }};
 menuIconViolence: icon {{ "menu/violence", menuIconColor }};
 menuIconHide: icon {{ "menu/hide", menuIconColor }};
+menuIconMention: icon {{ "menu/mention", menuSubmenuArrowFg }};
 menuIconMuteFor: icon {{ "menu/mute_for", menuIconColor }};
 menuIconSilent: icon {{ "menu/silent", menuIconColor }};
 menuIconCustomize: icon {{ "menu/customize", menuIconColor }};