Ensure drops cannot end up with inconsistent current minutes and progress

inventory.py

@@ -185,12 +185,10 @@ class TimedDrop(BaseDrop):
         super().__init__(campaign, data, claimed_benefits)
         self._manager: GUIManager = self._twitch.gui
         self._gui_inv: InventoryOverview = self._manager.inv
-        self.current_minutes: int = 0
-        if "self" in data:
-            self.current_minutes = data["self"]["currentMinutesWatched"]
+        self.current_minutes: int = "self" in data and data["self"]["currentMinutesWatched"] or 0
         self.required_minutes: int = data["requiredMinutesWatched"]
         if self.is_claimed:
-            # claimed drops report 0 current minutes, so we need to make a correction
+            # claimed drops may report inconsistent current minutes, so we need to overwrite them
             self.current_minutes = self.required_minutes
 
     def __repr__(self) -> str:
@@ -224,9 +222,11 @@ class TimedDrop(BaseDrop):
 
     @cached_property
     def progress(self) -> float:
-        if self.required_minutes > 0:
+        if self.current_minutes <= 0 or self.required_minutes <= 0:
+            return 0.0
+        elif self.current_minutes >= self.required_minutes:
+            return 1.0
         return self.current_minutes / self.required_minutes
-        return 0.0  # Drops with 0 required minutes are filtered via _base_can_earn
 
     def _base_can_earn(self) -> bool:
         return self.required_minutes > 0 and super()._base_can_earn()
@@ -248,7 +248,12 @@ class TimedDrop(BaseDrop):
         return result
 
     def update_minutes(self, minutes: int):
+        if minutes < 0:
+            return
+        elif minutes <= self.required_minutes:
             self.current_minutes = minutes
+        else:
+            self.current_minutes = self.required_minutes
         self._on_minutes_changed()
         self.display()