windowrules: add noclosefor

fixes #10027

src/desktop/Window.hpp

@@ -311,6 +311,9 @@ class CWindow {
     // ANR
     PHLANIMVAR<float> m_notRespondingTint;
 
+    // For the noclosefor windowrule
+    Time::steady_tp m_closeableSince = Time::steadyNow();
+
     // For the list lookup
     bool operator==(const CWindow& rhs) const {
         return m_xdgSurface == rhs.m_xdgSurface && m_xwaylandSurface == rhs.m_xwaylandSurface && m_position == rhs.m_position && m_size == rhs.m_size &&