Python: Fix crash when deleting files owned by library

CHANGES

@@ -16,6 +16,7 @@ Bugfixes:
  - GBA SIO: Prevent writing read-only multiplayer bits
  - Qt: Fix color picking in sprite view (fixes mgba.io/i/1307)
  - GB: Fix crash when accessing SRAM if no save loaded and cartridge has no SRAM
+ - Python: Fix crash when deleting files owned by library
 Misc:
  - GBA Savedata: EEPROM performance fixes
  - GBA Savedata: Automatically map 1Mbit Flash files as 1Mbit Flash

src/platform/python/mgba/core.py

@@ -180,11 +180,17 @@ class Core(object):
 
     @protected
     def load_bios(self, vfile, id=0):
-        return bool(self._core.loadBIOS(self._core, vfile.handle, id))
+        res = bool(self._core.loadBIOS(self._core, vfile.handle, id))
+        if res:
+            vfile._claimed = True
+        return res
 
     @protected
     def load_save(self, vfile):
-        return bool(self._core.loadSave(self._core, vfile.handle))
+        res = bool(self._core.loadSave(self._core, vfile.handle))
+        if res:
+            vfile._claimed = True
+        return res
 
     @protected
     def load_temporary_save(self, vfile):

src/platform/python/mgba/vfs.py

@@ -112,11 +112,16 @@ class VFile:
     def __init__(self, vf, _no_gc=None):
         self.handle = vf
         self._no_gc = _no_gc
+        self._claimed = False
 
     def __del__(self):
-        self.close()
+        if not self._claimed:
+            self.close()
 
     def close(self):
+        if self._claimed:
+            return False
+        self._claimed = True
         return bool(self.handle.close(self.handle))
 
     def seek(self, offset, whence):