Added x-attach-split-to-window command line arg (#2411)

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

src/singletons/WindowManager.cpp

@@ -28,6 +28,7 @@
 #include "util/Clamp.hpp"
 #include "util/CombinePath.hpp"
 #include "widgets/AccountSwitchPopup.hpp"
+#include "widgets/FramelessEmbedWindow.hpp"
 #include "widgets/Notebook.hpp"
 #include "widgets/Window.hpp"
 #include "widgets/dialogs/SettingsDialog.hpp"
@@ -130,6 +131,8 @@ WindowManager::WindowManager()
     });
 }
 
+WindowManager::~WindowManager() = default;
+
 MessageElementFlags WindowManager::getWordFlags()
 {
     return this->wordFlags_;
@@ -269,22 +272,14 @@ Window &WindowManager::createWindow(WindowType type, bool show)
     return *window;
 }
 
-int WindowManager::windowCount()
+void WindowManager::select(Split *split)
 {
-    return this->windows_.size();
+    this->selectSplit.invoke(split);
 }
 
-Window *WindowManager::windowAt(int index)
+void WindowManager::select(SplitContainer *container)
 {
-    assertInGuiThread();
-
-    if (index < 0 || (size_t)index >= this->windows_.size())
-    {
-        return nullptr;
-    }
-    qCDebug(chatterinoWindowmanager) << "getting window at bad index" << index;
-
-    return this->windows_.at(index);
+    this->selectSplitContainer.invoke(container);
 }
 
 QPoint WindowManager::emotePopupPos()
@@ -324,11 +319,23 @@ void WindowManager::initialize(Settings &settings, Paths &paths)
         this->applyWindowLayout(windowLayout);
     }
 
+    if (getArgs().isFramelessEmbed)
+    {
+        this->framelessEmbedWindow_.reset(new FramelessEmbedWindow);
+        this->framelessEmbedWindow_->show();
+    }
+
     // No main window has been created from loading, create an empty one
     if (this->mainWindow_ == nullptr)
     {
         this->mainWindow_ = &this->createWindow(WindowType::Main);
         this->mainWindow_->getNotebook().addPage(true);
+
+        // TODO: don't create main window if it's a frameless embed
+        if (getArgs().isFramelessEmbed)
+        {
+            this->mainWindow_->hide();
+        }
     }
 
     settings.timestampFormat.connect([this](auto, auto) {
@@ -634,6 +641,11 @@ WindowLayout WindowManager::loadWindowLayoutFromFile() const
 
 void WindowManager::applyWindowLayout(const WindowLayout &layout)
 {
+    if (getArgs().dontLoadMainWindow)
+    {
+        return;
+    }
+
     // Set emote popup position
     this->emotePopupPos_ = layout.emotePopupPos_;