fix(windows): resolve disappearing cursor after KVM switch (#4407)

src/platform/common.h

@@ -610,6 +610,8 @@ namespace platf {
   };
   void adjust_thread_priority(thread_priority_e priority);
 
+  void enable_mouse_keys();
+
   // Allow OS-specific actions to be taken to prepare for streaming
   void streaming_will_start();
   void streaming_will_stop();

src/platform/linux/misc.cpp

@@ -327,6 +327,10 @@ namespace platf {
     // Unimplemented
   }
 
+  void enable_mouse_keys() {
+    // Unimplemented
+  }
+
   void streaming_will_start() {
     // Nothing to do
   }

src/platform/macos/misc.mm

@@ -214,6 +214,10 @@ namespace platf {
     // Unimplemented
   }
 
+  void enable_mouse_keys() {
+    // Unimplemented
+  }
+
   void streaming_will_start() {
     // Nothing to do
   }

src/platform/windows/misc.cpp

@@ -1133,7 +1133,10 @@ namespace platf {
         }
       }
     }
+    enable_mouse_keys();
+  }
 
+  void enable_mouse_keys() {
     // If there is no mouse connected, enable Mouse Keys to force the cursor to appear
     if (!GetSystemMetrics(SM_MOUSEPRESENT)) {
       BOOST_LOG(info) << "A mouse was not detected. Sunshine will enable Mouse Keys while streaming to force the mouse cursor to appear.";

src/video.cpp

@@ -1977,6 +1977,10 @@ namespace video {
       }
 
       session->request_normal_frame();
+
+      // While streaming check to see if the mouse is present and enable Mouse Keys to force the cursor to appear
+      // This is useful for KVM switch scenarios where mouse may disappear during streaming
+      platf::enable_mouse_keys();
     }
   }