Fix #4022: Mac cursor offset on launch (#13095)

Update config when forcing windowed mode

distribution/changelog.txt

@@ -9,6 +9,7 @@
 - Change: [#13160] The lay-out of the Park Cheats tab has been improved.
 - Fix: [#1324] Last track piece map selection still visible when placing ride entrance or exit (original bug).
 - Fix: [#3200] Close Construction window upon selecting vehicle page.
+- Fix: [#4022] Fix Mac cursor offset on launch
 - Fix: [#4041] Garbled park option on scenario editor with custom theme.
 - Fix: [#5178] Lighting effects cannot be disabled in software mode
 - Fix: [#5904] Empty errors on tile inspector base height change.

src/openrct2-ui/UiContext.cpp

@@ -678,8 +678,13 @@ private:
         OnResize(width, height);
 
         UpdateFullscreenResolutions();
-        SetFullscreenMode(static_cast<FULLSCREEN_MODE>(gConfigGeneral.fullscreen_mode));
 
+        // Fix #4022: Force Mac to windowed to avoid cursor offset on launch issue
+#ifdef __MACOSX__
+        gConfigGeneral.fullscreen_mode = static_cast<int32_t>(OpenRCT2::Ui::FULLSCREEN_MODE::WINDOWED);
+#else
+        SetFullscreenMode(static_cast<FULLSCREEN_MODE>(gConfigGeneral.fullscreen_mode));
+#endif
         TriggerResize();
     }