Fix multiple instances of Tribler on Flatpak

src/tribler/core/utilities/process_manager/manager.py

@@ -119,7 +119,7 @@ def primary_process_rowid(self, kind: ProcessKind) -> Optional[int]:
             row = cursor.fetchone()
             if row is not None:
                 process = TriblerProcess.from_row(self, row)
-                if process.is_running():
+                if process.is_current_process() or process.is_running():
                     return process.rowid
 
                 # Process is not running anymore; mark it as not primary

src/tribler/core/utilities/process_manager/process.py

@@ -140,7 +140,7 @@ def current_process(cls, kind: ProcessKind,
 
     def is_current_process(self) -> bool:
         """Returns True if the object represents the current process"""
-        return self.pid == os.getpid() and self.is_running()
+        return self.pid == os.getpid()
 
     @with_retry
     def become_primary(self) -> bool:

src/tribler/core/utilities/process_manager/tests/test_manager.py

@@ -11,6 +11,7 @@
 # pylint: disable=protected-access
 
 
+@patch('os.getpid', new=lambda: 1)
 def test_become_primary(process_manager: ProcessManager):
     # Initially process manager fixture creates a primary current process that is a single process in DB
     p1 = process_manager.current_process