Add opening tab in popup (#3082)

Co-authored-by: zneix <zneix@zneix.eu>
Co-authored-by: Rasmus Karlsson <rasmus.karlsson@pajlada.com>

src/widgets/splits/SplitContainer.cpp

@@ -9,6 +9,7 @@
 #include "util/Helpers.hpp"
 #include "util/LayoutCreator.hpp"
 #include "widgets/Notebook.hpp"
+#include "widgets/Window.hpp"
 #include "widgets/helper/ChannelView.hpp"
 #include "widgets/helper/NotebookTab.hpp"
 #include "widgets/splits/ClosedSplits.hpp"
@@ -761,6 +762,33 @@ void SplitContainer::applyFromDescriptor(const NodeDescriptor &rootNode)
     this->layout();
 }
 
+void SplitContainer::popup()
+{
+    Window &window = getApp()->windows->createWindow(WindowType::Popup);
+    auto popupContainer = window.getNotebook().getOrAddSelectedPage();
+
+    QJsonObject encodedTab;
+    WindowManager::encodeTab(this, true, encodedTab);
+    TabDescriptor tab = TabDescriptor::loadFromJSON(encodedTab);
+
+    // custom title
+    if (!tab.customTitle_.isEmpty())
+    {
+        popupContainer->getTab()->setCustomTitle(tab.customTitle_);
+    }
+
+    // highlighting on new messages
+    popupContainer->getTab()->setHighlightsEnabled(tab.highlightsEnabled_);
+
+    // splits
+    if (tab.rootNode_)
+    {
+        popupContainer->applyFromDescriptor(*tab.rootNode_);
+    }
+
+    window.show();
+}
+
 void SplitContainer::applyFromDescriptorRecursively(
     const NodeDescriptor &rootNode, Node *node)
 {