Added ability to switch between folders with shortcuts.

Telegram/SourceFiles/core/shortcuts.cpp

@@ -346,6 +346,9 @@ void Manager::fillDefaults() {
 		set(qsl("%1+shift+%2").arg(ctrl).arg(index > 9 ? 0 : index), command);
 	}
 
+	set(qsl("%1+shift+down").arg(ctrl), Command::FolderNext);
+	set(qsl("%1+shift+up").arg(ctrl), Command::FolderPrevious);
+
 	set(qsl("ctrl+0"), Command::ChatSelf);
 
 	set(qsl("ctrl+9"), Command::ShowArchive);

Telegram/SourceFiles/core/shortcuts.h

@@ -46,6 +46,9 @@ enum class Command {
 	ShowFolder9,
 	ShowFolder10,
 
+	FolderNext,
+	FolderPrevious,
+
 	ShowArchive,
 
 	JustSendMessage,

Telegram/SourceFiles/dialogs/dialogs_inner_widget.cpp

@@ -3053,6 +3053,35 @@ void InnerWidget::setupShortcuts() {
 			});
 		}
 
+		const auto nearFolder = [=](bool isNext) {
+			const auto id = _controller->activeChatsFilterCurrent();
+			const auto list = &session().data().chatsFilters().list();
+			const auto it = (id == 0)
+				? begin(*list) - 1
+				: ranges::find(*list, id, &Data::ChatFilter::id);
+			if (it == end(*list) && id != 0) {
+				return false;
+			}
+			const auto i = isNext ? 1 : -1;
+			const auto index = it - begin(*list) + i;
+			if (index >= (int)list->size() || index < -1) {
+				return false;
+			}
+			const auto filterId = (index == -1)
+				? 0
+				: list->at(index).id();
+			_controller->setActiveChatsFilter(filterId);
+			return true;
+		};
+
+		request->check(Command::FolderNext) && request->handle([=] {
+			return nearFolder(true);
+		});
+
+		request->check(Command::FolderPrevious) && request->handle([=] {
+			return nearFolder(false);
+		});
+
 		if (session().supportMode() && row.key.history()) {
 			request->check(
 				Command::SupportScrollToCurrent