skip applying floating size constraints for undocked frame

Skip applying floating size constraints while the dock's group is still in the main
layout - fixes the top row growing taller on undock.

Author: Eism

framework/dockwindow_v2/internal/dockbase.cpp

@@ -712,6 +712,10 @@ void DockBase::applySizeConstraints()
 
     KDDockWidgets::Core::Group* group = groupForDockWidget(m_dockWidget);
 
+    if (m_floating && group && group->isInMainWindow()) {
+        return;
+    }
+
     if (group) {
         group->view()->setMinimumSize(minimumSize);
         group->view()->setMaximumSize(maximumSize);