decoration: Stacked group tabs (#5886)

* Stacked group tabs

* Fix index when creating groupbar title textures

* Changes for stacked dnd

* formatting

* Don't remove internal horizontal padding when calculating stacked bar
width

src/render/decorations/CHyprGroupBarDecoration.hpp

@@ -54,6 +54,7 @@ class CHyprGroupBarDecoration : public IHyprWindowDecoration {
     std::deque<PHLWINDOWREF> m_dwGroupMembers;
 
     float                    m_fBarWidth;
+    float                    m_fBarHeight;
 
     CTitleTex*               textureFromTitle(const std::string&);
     void                     invalidateTextures();