[MG_Backend] (P12 review): an ended server session's swap interval is forgotten, so the next session in the in-process display server starts at the driver's default

DirectGLES keeps the requested eglSwapInterval in a process global on purpose (a surface re-created mid-session re-applies it), and every server process used to serve one session. The in-process display server serves the next session in the same process, which then silently inherited the previous client's interval. The server backend's destruction under a transport now calls DirectGLES::ForgetRequestedSwapInterval() beside DropEveryTwinForEndedServerSession (split build only; the pull build is unchanged, G1).

MobileGL/MG_Backend/DirectGLES/BackendObject_DirectGLES.cpp

@@ -898,7 +898,11 @@ namespace MobileGL::MG_Backend::DirectGLES {
         // display server runs the next session in this same process, so the twins this one built
         // - naming ids of the context just destroyed - must not answer for the next client's
         // handles (Managers.h, DropEveryTwinForEndedServerSession). Monolith keeps its twins.
-        if (MG_Config::Transport != MG_Config::TransportMode::Monolith) DropEveryTwinForEndedServerSession();
+        if (MG_Config::Transport != MG_Config::TransportMode::Monolith) {
+            DropEveryTwinForEndedServerSession();
+            // Review fix: and the swap interval it asked for (DirectGLES.h).
+            ForgetRequestedSwapInterval();
+        }
 #endif
     }
 

MobileGL/MG_Backend/DirectGLES/DirectGLES.cpp

@@ -16246,6 +16246,10 @@ namespace MobileGL::MG_Backend::DirectGLES {
         ApplyRequestedSwapInterval();
     }
 
+#if MOBILEGL_BUILD_DISAGGREGATED
+    void ForgetRequestedSwapInterval() { g_requestedSwapInterval = -1; }
+#endif
+
     Bool InitWindowSurface(NativeWindowType window) {
         if (!window) return false;
 

MobileGL/MG_Backend/DirectGLES/DirectGLES.h

@@ -188,6 +188,13 @@ namespace MobileGL::MG_Backend::DirectGLES {
     // Applies (or defers until the window surface exists) the app-requested
     // eglSwapInterval on the native EGL surface.
     void SetSwapInterval(Int interval);
+#if MOBILEGL_BUILD_DISAGGREGATED
+    // P12 review fix: the swap interval an ended server session asked for is not the next one's.
+    // The request outlives the context on purpose (a surface re-created mid-session re-applies it),
+    // so the in-process display server's session end forgets it: the next session starts at the
+    // driver's default until it asks (BackendObject_DirectGLES's destructor under a transport).
+    void ForgetRequestedSwapInterval();
+#endif
     void SetEGLFuncsTable(const MG_External::EGLFunctionsTable& eglFuncs);
     void SetGLESFuncsTable(const MG_External::GLESFunctionsTable& glesFuncs);
     void SetGLESCapabilities(const MG_External::GLESCapabilities& capabilities);