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guard parent in X11TransientFor
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@ -232,6 +232,9 @@ CWindow* CWindow::X11TransientFor() {
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PPARENT = g_pCompositor->getWindowFromSurface(PPARENT->m_uSurface.xwayland->parent->surface);
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}
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if (!g_pCompositor->windowValidMapped(PPARENT))
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return nullptr;
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return PPARENT;
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}
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