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

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

src/widgets/splits/Split.hpp

@@ -38,7 +38,6 @@ class Split : public BaseWidget, pajlada::Signals::SignalHolder
     Q_OBJECT
 
 public:
-    explicit Split(SplitContainer *parent);
     explicit Split(QWidget *parent);
 
     ~Split() override;
@@ -48,7 +47,6 @@ public:
     pajlada::Signals::NoArgSignal focusLost;
 
     ChannelView &getChannelView();
-    SplitContainer *getContainer();
 
     IndirectChannel getIndirectChannel();
     ChannelPtr getChannel();
@@ -80,6 +78,24 @@ public:
         modifierStatusChanged;
     static Qt::KeyboardModifiers modifierStatus;
 
+    enum class Action {
+        RefreshTab,
+        ResetMouseStatus,
+        AppendNewSplit,
+        Delete,
+
+        SelectSplitLeft,
+        SelectSplitRight,
+        SelectSplitAbove,
+        SelectSplitBelow,
+    };
+
+    pajlada::Signals::Signal<Action> actionRequested;
+    pajlada::Signals::Signal<ChannelPtr> openSplitRequested;
+
+    // args: (SplitContainer::Direction dir, Split* parent)
+    pajlada::Signals::Signal<int, Split *> insertSplitRequested;
+
 protected:
     void paintEvent(QPaintEvent *event) override;
     void mouseMoveEvent(QMouseEvent *event) override;
@@ -98,7 +114,6 @@ private:
     void handleModifiers(Qt::KeyboardModifiers modifiers);
     void updateInputPlaceholder();
 
-    SplitContainer *container_;
     IndirectChannel channel_;
 
     bool moderationMode_{};