Support Flatpak and Snap Discord; keep the timer when a game changes process

Look for discord-ipc sockets in the Flatpak and Snap runtime folders too. When a game moves to another
process (e.g. at Steam launch), keep its first start time and don't resend the activity. Bump version to 0.2.

tests/test_discord_game_presence.py

@@ -2,6 +2,7 @@ import json
 import os
 import socket
 import struct
+import tempfile
 import threading
 import time
 from collections.abc import Iterator
@@ -158,6 +159,9 @@ def test_choose() -> None:
     assert dgp.choose([], None) is None
     assert dgp.choose([a, b], None) == a
     assert dgp.choose([a, b], b) == b
+    # same app on a newer process: keep the first start so the timer doesn't restart
+    moved = dgp.Game(dgp.App("2", "B"), 3, 205)
+    assert dgp.choose([a, moved], b) == dgp.Game(dgp.App("2", "B"), 3, 200)
     assert dgp.choose([a], b) == a
 
 
@@ -291,9 +295,10 @@ class FakeDiscord:
 
 
 @pytest.fixture
-def runtime_dir(tmp_path: Path) -> Iterator[Path]:
-    # AF_UNIX paths are limited to ~108 bytes, so don't nest deeply
-    yield tmp_path
+def runtime_dir() -> Iterator[Path]:
+    # AF_UNIX paths are limited to 107 bytes: tmp_path plus the Flatpak subdir can exceed it
+    with tempfile.TemporaryDirectory(prefix="dgp-", dir="/tmp") as d:
+        yield Path(d)
 
 
 def test_ipc_set_activity(runtime_dir: Path) -> None:
@@ -316,6 +321,15 @@ def test_ipc_later_socket(runtime_dir: Path) -> None:
     dgp.DiscordIPC.connect("123", runtime_dir).close()
 
 
+@pytest.mark.parametrize("subdir", ["app/com.discordapp.Discord", "snap.discord"])
+def test_ipc_sandbox_socket(runtime_dir: Path, subdir: str) -> None:
+    (runtime_dir / subdir).mkdir(parents=True)
+    discord = FakeDiscord(runtime_dir / subdir / "discord-ipc-0")
+    dgp.DiscordIPC.connect("123", runtime_dir).close()
+    assert discord.received[0] == (dgp.OP_HANDSHAKE, {"v": 1, "client_id": "123"})
+    discord.stop()
+
+
 def test_ipc_no_socket(runtime_dir: Path) -> None:
     with pytest.raises(FileNotFoundError):
         dgp.DiscordIPC.connect("123", runtime_dir)
@@ -352,6 +366,7 @@ def test_presence(runtime_dir: Path) -> None:
     presence.update(genshin)
     assert presence.shown == genshin
     presence.update(genshin)  # unchanged: nothing sent
+    presence.update(dgp.Game(genshin.app, 11, 100))  # another process, same timer: nothing sent
     assert len(discord.received) == 2
 
     presence.update(neverwinter)  # another app needs a new connection