SaraSuite.app for macOS, built on Linux; 1.3.0

SelfUpdate.py

@@ -9,8 +9,9 @@ restarts into it. The file keeps its path, so its menu entry keeps working.
 - Linux: the download is renamed over the running AppImage (allowed).
 - Windows: a running .exe can't be overwritten but can be renamed, so the
   old one becomes SaraSuite.old.exe (deleted on the next start).
-- macOS: SaraSuite.app (a folder) comes zipped; it's unpacked next to the
-  running one, which is renamed aside and deleted once the new one is in place.
+- macOS: SaraSuite.app (a folder, Packaging/BuildMacApp.py) comes zipped; it's
+  unpacked next to the running one, which is renamed aside and deleted once
+  the new one is in place.
 """
 
 import os
@@ -23,7 +24,7 @@ from pathlib import Path
 from typing import Callable, Optional
 from urllib.parse import urlsplit
 
-from Core import AppName, AppVersion, ChildEnvironment, IsFrozen, IsMac, IsWindows, LoadConfig
+from Core import AppName, AppVersion, ChildEnvironment, IsFrozen, IsMac, IsWindows, LoadConfig, MacApp
 from Sources import GetBytes, GetJson, SourceError
 
 AssetName = f"{AppName}.exe" if IsWindows else f"{AppName}-macOS.zip" if IsMac else f"{AppName}-x86_64.AppImage"
@@ -42,9 +43,7 @@ def RunningAppImage() -> Optional[Path]:
     if IsWindows:
         return Path(sys.executable) if IsFrozen else None
     if IsMac:
-        # .../SaraSuite.app/Contents/MacOS/SaraSuite
-        Bundle = Path(sys.executable).resolve().parents[2]
-        return Bundle if IsFrozen and Bundle.suffix == ".app" else None
+        return Path(MacApp) if MacApp.endswith(".app") else None
     Value = os.environ.get("APPIMAGE", "")
     return Path(Value) if Value else None