Added ability to delete added poll answer.

Telegram/Resources/langs/lang.strings

@@ -4978,6 +4978,7 @@ https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
 "lng_context_reply_to_task" = "Reply to Task";
 "lng_context_reply_to_poll_option" = "Reply to Option";
 "lng_context_copy_poll_option" = "Copy Option";
+"lng_context_delete_poll_option" = "Delete Option";
 "lng_context_edit_msg" = "Edit";
 "lng_context_draw" = "Edit Image";
 "lng_context_add_factcheck" = "Add Fact Check";

Telegram/SourceFiles/api/api_polls.cpp

@@ -231,6 +231,27 @@ void Polls::addAnswer(
 	_pollAddAnswerRequestIds.emplace(itemId, requestId);
 }
 
+void Polls::deleteAnswer(FullMsgId itemId, const QByteArray &option) {
+	if (_pollVotesRequestIds.contains(itemId)) {
+		return;
+	}
+	const auto item = _session->data().message(itemId);
+	if (!item) {
+		return;
+	}
+	const auto requestId = _api.request(MTPmessages_DeletePollAnswer(
+		item->history()->peer->input(),
+		MTP_int(item->id),
+		MTP_bytes(option)
+	)).done([=](const MTPUpdates &result) {
+		_pollVotesRequestIds.erase(itemId);
+		_session->updates().applyUpdates(result);
+	}).fail([=] {
+		_pollVotesRequestIds.erase(itemId);
+	}).send();
+	_pollVotesRequestIds.emplace(itemId, requestId);
+}
+
 void Polls::close(not_null<HistoryItem*> item) {
 	const auto itemId = item->fullId();
 	if (_pollCloseRequestIds.contains(itemId)) {

Telegram/SourceFiles/api/api_polls.h

@@ -42,6 +42,7 @@ public:
 		const PollMedia &media,
 		Fn<void()> done,
 		Fn<void(QString)> fail);
+	void deleteAnswer(FullMsgId itemId, const QByteArray &option);
 	void close(not_null<HistoryItem*> item);
 	void reloadResults(not_null<HistoryItem*> item);
 

Telegram/SourceFiles/history/history_inner_widget.cpp

@@ -7,6 +7,7 @@ https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
 */
 #include "history/history_inner_widget.h"
 
+#include "api/api_polls.h"
 #include "chat_helpers/stickers_emoji_pack.h"
 #include "core/application.h"
 #include "core/file_utilities.h"
@@ -2995,6 +2996,18 @@ void HistoryInner::showContextMenu(QContextMenuEvent *e, bool showFromTouch) {
 							TextUtilities::SetClipboardText(text);
 						},
 						&st::menuIconCopy);
+					if (poll->creator() && a->addedDate) {
+						const auto itemId = item->fullId();
+						const auto option = pollOptionLink;
+						_menu->addAction(
+							tr::lng_context_delete_poll_option(tr::now),
+							[=] {
+								poll->session().api().polls().deleteAnswer(
+									itemId,
+									option);
+							},
+							&st::menuIconDelete);
+					}
 				}
 			}
 		}

Telegram/SourceFiles/history/view/history_view_context_menu.cpp

@@ -1323,6 +1323,17 @@ base::unique_qptr<Ui::PopupMenu> FillContextMenu(
 								TextUtilities::SetClipboardText(text);
 							},
 							&st::menuIconCopy);
+						if (poll->creator() && a->addedDate) {
+							const auto itemId = item->fullId();
+							result->addAction(
+								tr::lng_context_delete_poll_option(tr::now),
+								[=] {
+									poll->session().api().polls().deleteAnswer(
+										itemId,
+										pollOption);
+								},
+								&st::menuIconDelete);
+						}
 					}
 				}
 			}