xdph: end share when the shared window closes

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

patches/xdph-close-session-on-window-close.patch

@@ -0,0 +1,44 @@
+--- a/src/portals/Screencopy.cpp
++++ b/src/portals/Screencopy.cpp
+@@ -625,6 +625,19 @@
+     return m_sState.toplevel;
+ }
+ 
++// A shared window went away: close its sessions like other portals do, so the
++// app's track ends instead of streaming the last frame forever.
++void CScreencopyPortal::onToplevelClosed(CCZwlrForeignToplevelHandleV1* handle) {
++    for (auto& s : m_vSessions) {
++        if (!s->session || s->selection.type != TYPE_WINDOW || s->selection.windowHandle.get() != handle)
++            continue;
++
++        Debug::log(LOG, "[screencopy] Shared window closed, closing session {}", s->sessionHandle.c_str());
++        s->session->object->emitSignal("Closed").onInterface(sdbus::InterfaceName{"org.freedesktop.impl.portal.Session"});
++        s->session->onDestroy();
++    }
++}
++
+ CScreencopyPortal::SSession* CScreencopyPortal::getSession(sdbus::ObjectPath& path) {
+     for (auto& s : m_vSessions) {
+         if (s->sessionHandle == path)
+--- a/src/portals/Screencopy.hpp
++++ b/src/portals/Screencopy.hpp
+@@ -113,6 +113,7 @@
+     void                                 startFrameCopy(SSession* pSession);
+     void                                 queueNextShareFrame(SSession* pSession);
+     bool                                 hasToplevelCapabilities();
++    void                                 onToplevelClosed(CCZwlrForeignToplevelHandleV1* handle);
+ 
+     std::unique_ptr<CPipewireConnection> m_pPipewire;
+ 
+--- a/src/shared/ToplevelManager.cpp
++++ b/src/shared/ToplevelManager.cpp
+@@ -18,6 +18,9 @@
+     handle->setClosed([this](CCZwlrForeignToplevelHandleV1* r) {
+         Debug::log(TRACE, "[toplevel] toplevel at {} closed", (void*)this);
+ 
++        if (g_pPortalManager->m_sPortals.screencopy)
++            g_pPortalManager->m_sPortals.screencopy->onToplevelClosed(r);
++
+         std::erase_if(g_pPortalManager->m_sHelpers.toplevel->m_vToplevels, [&](const auto& e) { return e.get() == this; });
+         if (g_pPortalManager->m_sHelpers.toplevelMapping)
+             g_pPortalManager->m_sHelpers.toplevelMapping->m_muAddresses.erase(this->handle);

settings/hyprland.nix

@@ -11,6 +11,11 @@ in
     programs.hyprland = {
       enable = true;
       xwayland.enable = true;
+      # Closing a window that's being shared ends the share (Discord stops the
+      # stream) instead of streaming its last frame forever.
+      portalPackage = pkgs.xdg-desktop-portal-hyprland.overrideAttrs (old: {
+        patches = (old.patches or [ ]) ++ [ ../patches/xdph-close-session-on-window-close.patch ];
+      });
     };
 
     # Let Hyprland show the session menu for a short power-key press instead