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subsurfaceTree: Fix nullptr crash when disconnecting a monitor (#4577)

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I was able to reproduce this frequently by having a kitty terminal on an
monitor running the following command and then unplugging that monitor:

`while true; do echo "" && sleep 0.02; done`
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Abílio Costa 2024-02-01 03:09:31 +00:00 committed by GitHub
parent cfd68af5b6
commit 15316aaa31
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2
src/helpers/SubsurfaceTree.cpp
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@ -262,7 +262,7 @@ void Events::listener_commitSubsurface(void* owner, void* data) {
// tearing: if solitary, redraw it. This still might be a single surface window
const auto PMONITOR = g_pCompositor->getMonitorFromID(pNode->pWindowOwner->m_iMonitorID);
if (PMONITOR->solitaryClient == pNode->pWindowOwner && pNode->pWindowOwner->canBeTorn() && PMONITOR->tearingState.canTear &&
if (PMONITOR && PMONITOR->solitaryClient == pNode->pWindowOwner && pNode->pWindowOwner->canBeTorn() && PMONITOR->tearingState.canTear &&
pNode->pSurface->wlr()->current.committed & WLR_SURFACE_STATE_BUFFER) {
CRegion damageBox{&pNode->pSurface->wlr()->buffer_damage};