Fix pen generated mouse events not having SDL_PEN_MOUSEID (#12392)

* Update SDL_mouse.c

Stop a mouseID of SDL_PEN_MOUSEID being discarded when dispatching mouse events. I'm not sure if this enough to fix the lack of SDL_PEN_MOUSEID being emitted.

* Update SDL_mouse.c

Since we test for touch input here we also test for pen input in the same way.

* Stop duplicate synthetic touch events

If SDL_HINT_PEN_MOUSE_EVENTS and SDL_HINT_MOUSE_TOUCH_EVENTS are both enabled, the pen generated synthetic mouse event will then produce a touch event without this additional check.

This requires the previous commits in order to do anything since it needs to be able to identify those pen generated mouse events.

src/events/SDL_mouse.c

@@ -631,7 +631,7 @@ void SDL_SendMouseMotion(Uint64 timestamp, SDL_Window *window, SDL_MouseID mouse
 {
     if (window && !relative) {
         SDL_Mouse *mouse = SDL_GetMouse();
-        if (!SDL_UpdateMouseFocus(window, x, y, SDL_GetMouseButtonState(mouse, mouseID, true), (mouseID != SDL_TOUCH_MOUSEID))) {
+        if (!SDL_UpdateMouseFocus(window, x, y, SDL_GetMouseButtonState(mouse, mouseID, true), (mouseID != SDL_TOUCH_MOUSEID && mouseID != SDL_PEN_MOUSEID))) {
             return;
         }
     }
@@ -689,7 +689,7 @@ static void SDL_PrivateSendMouseMotion(Uint64 timestamp, SDL_Window *window, SDL
 
     // SDL_HINT_MOUSE_TOUCH_EVENTS: controlling whether mouse events should generate synthetic touch events
     if (mouse->mouse_touch_events) {
-        if (mouseID != SDL_TOUCH_MOUSEID && !relative && track_mouse_down) {
+        if (mouseID != SDL_TOUCH_MOUSEID && mouseID != SDL_PEN_MOUSEID && !relative && track_mouse_down) {
             if (window) {
                 float normalized_x = x / (float)window->w;
                 float normalized_y = y / (float)window->h;
@@ -777,7 +777,7 @@ static void SDL_PrivateSendMouseMotion(Uint64 timestamp, SDL_Window *window, SDL
 
     // Post the event, if desired
     if (SDL_EventEnabled(SDL_EVENT_MOUSE_MOTION)) {
-        if ((!mouse->relative_mode || mouse->warp_emulation_active) && mouseID != SDL_TOUCH_MOUSEID) {
+        if ((!mouse->relative_mode || mouse->warp_emulation_active) && mouseID != SDL_TOUCH_MOUSEID && mouseID != SDL_PEN_MOUSEID) {
             // We're not in relative mode, so all mouse events are global mouse events
             mouseID = SDL_GLOBAL_MOUSE_ID;
         }
@@ -880,7 +880,7 @@ static void SDL_PrivateSendMouseButton(Uint64 timestamp, SDL_Window *window, SDL
 
     // SDL_HINT_MOUSE_TOUCH_EVENTS: controlling whether mouse events should generate synthetic touch events
     if (mouse->mouse_touch_events) {
-        if (mouseID != SDL_TOUCH_MOUSEID && button == SDL_BUTTON_LEFT) {
+        if (mouseID != SDL_TOUCH_MOUSEID && mouseID != SDL_PEN_MOUSEID && button == SDL_BUTTON_LEFT) {
             if (down) {
                 track_mouse_down = true;
             } else {
@@ -948,7 +948,7 @@ static void SDL_PrivateSendMouseButton(Uint64 timestamp, SDL_Window *window, SDL
 
     // Post the event, if desired
     if (SDL_EventEnabled(type)) {
-        if ((!mouse->relative_mode || mouse->warp_emulation_active) && mouseID != SDL_TOUCH_MOUSEID) {
+        if ((!mouse->relative_mode || mouse->warp_emulation_active) && mouseID != SDL_TOUCH_MOUSEID && mouseID != SDL_PEN_MOUSEID) {
             // We're not in relative mode, so all mouse events are global mouse events
             mouseID = SDL_GLOBAL_MOUSE_ID;
         } else {