migrate usage of SetCursor(NULL) to RedrawCursor()

src/events/SDL_mouse.c

@@ -231,7 +231,7 @@ static void SDLCALL SDL_MouseRelativeCursorVisibleChanged(void *userdata, const
 
     mouse->relative_mode_hide_cursor = !(SDL_GetStringBoolean(hint, false));
 
-    SDL_SetCursor(NULL); // Update cursor visibility
+    SDL_RedrawCursor(); // Update cursor visibility
 }
 
 static void SDLCALL SDL_MouseIntegerModeChanged(void *userdata, const char *name, const char *oldValue, const char *hint)
@@ -606,7 +606,7 @@ void SDL_SetMouseFocus(SDL_Window *window)
     }
 
     // Update cursor visibility
-    SDL_SetCursor(NULL);
+    SDL_RedrawCursor();
 }
 
 bool SDL_MousePositionInWindow(SDL_Window *window, float x, float y)
@@ -1360,7 +1360,7 @@ bool SDL_SetRelativeMouseMode(bool enabled)
 
     if (enabled) {
         // Update cursor visibility before we potentially warp the mouse
-        SDL_SetCursor(NULL);
+        SDL_RedrawCursor();
     }
 
     if (enabled && focusWindow) {
@@ -1380,7 +1380,7 @@ bool SDL_SetRelativeMouseMode(bool enabled)
 
     if (!enabled) {
         // Update cursor visibility after we restore the mouse position
-        SDL_SetCursor(NULL);
+        SDL_RedrawCursor();
     }
 
     // Flush pending mouse motion - ideally we would pump events, but that's not always safe
@@ -1720,7 +1720,7 @@ bool SDL_ShowCursor(void)
 
     if (!mouse->cursor_visible) {
         mouse->cursor_visible = true;
-        SDL_SetCursor(NULL);
+        SDL_RedrawCursor();
     }
     return true;
 }
@@ -1731,7 +1731,7 @@ bool SDL_HideCursor(void)
 
     if (mouse->cursor_visible) {
         mouse->cursor_visible = false;
-        SDL_SetCursor(NULL);
+        SDL_RedrawCursor();
     }
     return true;
 }

src/video/riscos/SDL_riscosmodes.c

@@ -302,7 +302,7 @@ bool RISCOS_SetDisplayMode(SDL_VideoDevice *_this, SDL_VideoDisplay *display, SD
     }
 
     // Update cursor visibility, since it may have been disabled by the mode change.
-    SDL_SetCursor(NULL);
+    SDL_RedrawCursor();
 
     return true;
 }

src/video/wayland/SDL_waylandmouse.c

@@ -196,7 +196,7 @@ static DBusHandlerResult Wayland_DBusCursorMessageFilter(DBusConnection *conn, D
 
             if (dbus_cursor_size != new_cursor_size) {
                 dbus_cursor_size = new_cursor_size;
-                SDL_SetCursor(NULL); // Force cursor update
+                SDL_RedrawCursor(); // Force cursor update
             }
         } else if (SDL_strcmp(CURSOR_THEME_KEY, key) == 0) {
             const char *new_cursor_theme = NULL;
@@ -223,7 +223,7 @@ static DBusHandlerResult Wayland_DBusCursorMessageFilter(DBusConnection *conn, D
 
                 // Purge the current cached themes and force a cursor refresh.
                 Wayland_FreeCursorThemes(vdata);
-                SDL_SetCursor(NULL);
+                SDL_RedrawCursor();
             }
         } else {
             goto not_our_signal;

src/video/x11/SDL_x11mouse.c

@@ -552,7 +552,7 @@ void X11_QuitMouse(SDL_VideoDevice *_this)
 void X11_SetHitTestCursor(SDL_HitTestResult rc)
 {
     if (rc == SDL_HITTEST_NORMAL || rc == SDL_HITTEST_DRAGGABLE) {
-        SDL_SetCursor(NULL);
+        SDL_RedrawCursor();
     } else {
         X11_ShowCursor(sys_cursors[rc]);
     }