Fix process priority (#708)

Author: JacobDev1

fastflix/command_runner.py

@@ -9,6 +9,7 @@
 from subprocess import PIPE
 from threading import Thread
 from typing import Literal
+import sys
 
 from psutil import Popen
 
@@ -23,12 +24,12 @@
     )
 except ImportError:
     priority_levels = {
-        "Realtime": 20,
-        "High": 10,
-        "Above Normal": 5,
+        "Realtime": -20,
+        "High": -10,
+        "Above Normal": -5,
         "Normal": 0,
-        "Below Normal": -10,
-        "Idle": -20,
+        "Below Normal": 10,
+        "Idle": 19 if sys.platform == "linux" else 20,
     }
 else:
     priority_levels = {

fastflix/widgets/panels/queue_panel.py

@@ -230,8 +230,11 @@ def __init__(self, parent, app: FastFlixApp):
         self.load_queue_button.setFixedWidth(110)
 
         self.priority_widget = QtWidgets.QComboBox()
-        self.priority_widget.addItems(["Realtime", "High", "Above Normal", "Normal", "Below Normal", "Idle"])
-        self.priority_widget.setCurrentIndex(3)
+        self.priority_widget.addItems(
+            ([] if reusables.win_based else ["Realtime"])
+            + ["High", "Above Normal", "Normal", "Below Normal", "Idle"]
+        )
+        self.priority_widget.setCurrentText("Normal")
         self.priority_widget.currentIndexChanged.connect(self.set_priority)
 
         self.clear_queue = QtWidgets.QPushButton(