sokol_app.h: remove SAPP_EVENTTYPE_UPDATE_CURSOR

This was never really fleshed out, and the most common
use case is now provided by sapp_set_mouse_cursor().

sokol_app.h

@@ -122,7 +122,6 @@
     SUSPENDED           | ---     | ---   | ---   | YES   | YES     | YES  | ---   | TODO
     RESUMED             | ---     | ---   | ---   | YES   | YES     | YES  | ---   | TODO
     QUIT_REQUESTED      | YES     | YES   | YES   | ---   | ---     | ---  | TODO  | YES
-    UPDATE_CURSOR       | YES     | YES   | TODO  | ---   | ---     | TODO | ---   | TODO
     IME                 | TODO    | TODO? | TODO  | ???   | TODO    | ---  | ???   | ???
     key repeat flag     | YES     | YES   | YES   | ---   | ---     | YES  | TODO  | YES
     windowed            | YES     | YES   | YES   | ---   | ---     | YES  | TODO  | YES
@@ -1015,9 +1014,6 @@
     - sapp_desc needs a bool whether to initialize depth-stencil surface
     - GL context initialization needs more control (at least what GL version to initialize)
     - application icon
-    - the UPDATE_CURSOR event currently behaves differently between Win32 and OSX
-      (Win32 sends the event each frame when the mouse moves and is inside the window
-      client area, OSX sends it only once when the mouse enters the client area)
     - the Android implementation calls cleanup_cb() and destroys the egl context in onDestroy
       at the latest but should do it earlier, in onStop, as an app is "killable" after onStop
       on Android Honeycomb and later (it can't be done at the moment as the app may be started
@@ -1109,7 +1105,6 @@ typedef enum sapp_event_type {
     SAPP_EVENTTYPE_UNFOCUSED,
     SAPP_EVENTTYPE_SUSPENDED,
     SAPP_EVENTTYPE_RESUMED,
-    SAPP_EVENTTYPE_UPDATE_CURSOR,
     SAPP_EVENTTYPE_QUIT_REQUESTED,
     SAPP_EVENTTYPE_CLIPBOARD_PASTED,
     SAPP_EVENTTYPE_FILES_DROPPED,
@@ -1420,7 +1415,6 @@ typedef struct sapp_desc {
     bool fullscreen;                    // whether the window should be created in fullscreen mode
     bool alpha;                         // whether the framebuffer should have an alpha channel (ignored on some platforms)
     const char* window_title;           // the window title as UTF-8 encoded string
-    bool user_cursor;                   // if true, user is expected to manage cursor image in SAPP_EVENTTYPE_UPDATE_CURSOR
     bool enable_clipboard;              // enable clipboard access, default is false
     int clipboard_size;                 // max size of clipboard content in bytes
     bool enable_dragndrop;              // enable file dropping (drag'n'drop), default is false
@@ -4023,12 +4017,6 @@ _SOKOL_PRIVATE void _sapp_macos_poll_input_events() {
             _sapp_macos_mods(event));
     }
 }
-- (void)cursorUpdate:(NSEvent*)event {
-    _SOKOL_UNUSED(event);
-    if (_sapp.desc.user_cursor) {
-        _sapp_macos_app_event(SAPP_EVENTTYPE_UPDATE_CURSOR);
-    }
-}
 @end
 
 #endif /* MacOS */
@@ -6872,17 +6860,9 @@ _SOKOL_PRIVATE LRESULT CALLBACK _sapp_win32_wndproc(HWND hWnd, UINT uMsg, WPARAM
                 _sapp_win32_uwp_app_event(SAPP_EVENTTYPE_UNFOCUSED);
                 break;
             case WM_SETCURSOR:
-                if (_sapp.desc.user_cursor) {
-                    if (LOWORD(lParam) == HTCLIENT) {
-                        _sapp_win32_uwp_app_event(SAPP_EVENTTYPE_UPDATE_CURSOR);
-                        return TRUE;
-                    }
-                }
-                else {
-                    if (LOWORD(lParam) == HTCLIENT) {
-                        _sapp_win32_update_cursor(_sapp.mouse.current_cursor, _sapp.mouse.shown, true);
-                        return TRUE;
-                    }
+                if (LOWORD(lParam) == HTCLIENT) {
+                    _sapp_win32_update_cursor(_sapp.mouse.current_cursor, _sapp.mouse.shown, true);
+                    return TRUE;
                 }
                 break;
             case WM_DPICHANGED: