feat: add Quick Switcher item to open channel in a new popup window (#3828)

Co-authored-by: pajlada <rasmus.karlsson@pajlada.com>

src/widgets/dialogs/switcher/NewPopupItem.cpp

@@ -0,0 +1,57 @@
+#include "widgets/dialogs/switcher/NewPopupItem.hpp"
+
+#include "Application.hpp"
+#include "providers/twitch/TwitchIrcServer.hpp"
+#include "singletons/Fonts.hpp"
+#include "singletons/Theme.hpp"
+#include "singletons/WindowManager.hpp"
+#include "widgets/Notebook.hpp"
+#include "widgets/Window.hpp"
+#include "widgets/helper/NotebookTab.hpp"
+#include "widgets/splits/Split.hpp"
+
+namespace chatterino {
+
+NewPopupItem::NewPopupItem(const QString &channelName)
+    : AbstractSwitcherItem(QIcon(":/switcher/popup.svg"))
+    , channelName_(channelName)
+    , text_(QString(TEXT_FORMAT).arg(channelName))
+{
+}
+
+void NewPopupItem::action()
+{
+    auto *app = getApp();
+    auto &popup = app->windows->createWindow(WindowType::Popup, true);
+    auto *split =
+        popup.getNotebook().getOrAddSelectedPage()->appendNewSplit(false);
+    split->setChannel(app->twitch->getOrAddChannel(this->channelName_));
+}
+
+void NewPopupItem::paint(QPainter *painter, const QRect &rect) const
+{
+    painter->save();
+
+    painter->setRenderHint(QPainter::Antialiasing, true);
+
+    painter->setPen(getApp()->themes->splits.header.text);
+    painter->setBrush(Qt::SolidPattern);
+    painter->setFont(getApp()->fonts->getFont(FontStyle::UiMediumBold, 1.0));
+
+    QRect iconRect(rect.topLeft(), ICON_SIZE);
+    this->icon_.paint(painter, iconRect, Qt::AlignLeft | Qt::AlignVCenter);
+
+    QRect textRect =
+        QRect(iconRect.topRight(),
+              QSize(rect.width() - iconRect.width(), iconRect.height()));
+    painter->drawText(textRect, Qt::AlignLeft | Qt::AlignVCenter, this->text_);
+
+    painter->restore();
+}
+
+QSize NewPopupItem::sizeHint(const QRect &rect) const
+{
+    return QSize(rect.width(), ICON_SIZE.height());
+}
+
+}  // namespace chatterino