Don't show "Send As" button when editing a message.

Fixes #17302.

Telegram/SourceFiles/history/history_widget.cpp

@@ -2270,6 +2270,9 @@ void HistoryWidget::registerDraftSource() {
 void HistoryWidget::setEditMsgId(MsgId msgId) {
 	unregisterDraftSources();
 	_editMsgId = msgId;
+	if (_history) {
+		refreshSendAsToggle();
+	}
 	registerDraftSource();
 }
 
@@ -2388,7 +2391,7 @@ void HistoryWidget::setupSendAsToggle() {
 void HistoryWidget::refreshSendAsToggle() {
 	Expects(_peer != nullptr);
 
-	if (!session().sendAsPeers().shouldChoose(_peer)) {
+	if (_editMsgId || !session().sendAsPeers().shouldChoose(_peer)) {
 		_sendAs.destroy();
 		return;
 	} else if (_sendAs) {

Telegram/SourceFiles/history/view/controls/history_view_compose_controls.cpp

@@ -1012,6 +1012,10 @@ void ComposeControls::init() {
 	) | rpl::start_with_next([=](const auto &id) {
 		unregisterDraftSources();
 		updateSendButtonType();
+		if (_history && updateSendAsButton()) {
+			updateControlsVisibility();
+			updateControlsGeometry(_wrap->size());
+		}
 		registerDraftSource();
 	}, _wrap->lifetime());
 
@@ -1626,9 +1630,10 @@ void ComposeControls::initSendAsButton() {
 	) | rpl::filter([=](not_null<PeerData*> peer) {
 		return _history && (peer == _history->peer);
 	}) | rpl::start_with_next([=] {
-		updateSendAsButton();
+		if (updateSendAsButton()) {
-		updateControlsVisibility();
+			updateControlsVisibility();
-		updateControlsGeometry(_wrap->size());
+			updateControlsGeometry(_wrap->size());
+		}
 	}, _wrap->lifetime());
 }
 
@@ -1942,21 +1947,27 @@ void ComposeControls::updateMessagesTTLShown() {
 	}
 }
 
-void ComposeControls::updateSendAsButton() {
+bool ComposeControls::updateSendAsButton() {
 	Expects(_history != nullptr);
 
 	const auto peer = _history->peer;
-	if (!session().sendAsPeers().shouldChoose(peer)) {
+	if (isEditingMessage() || !session().sendAsPeers().shouldChoose(peer)) {
+		if (!_sendAs) {
+			return false;
+		}
 		_sendAs = nullptr;
-	} else if (!_sendAs) {
+		return true;
-		_sendAs = std::make_unique<Ui::SendAsButton>(
+	} else if (_sendAs) {
-			_wrap.get(),
+		return false;
-			st::sendAsButton);
-		Ui::SetupSendAsButton(
-			_sendAs.get(),
-			rpl::single(peer.get()),
-			_window);
 	}
+	_sendAs = std::make_unique<Ui::SendAsButton>(
+		_wrap.get(),
+		st::sendAsButton);
+	Ui::SetupSendAsButton(
+		_sendAs.get(),
+		rpl::single(peer.get()),
+		_window);
+	return true;
 }
 
 void ComposeControls::paintBackground(QRect clip) {

Telegram/SourceFiles/history/view/controls/history_view_compose_controls.h

@@ -206,7 +206,7 @@ private:
 	void updateSubmitSettings();
 	void updateSendButtonType();
 	void updateMessagesTTLShown();
-	void updateSendAsButton();
+	bool updateSendAsButton();
 	void updateHeight();
 	void updateWrappingVisibility();
 	void updateControlsVisibility();