Add an option to prefer primary tasked aircraft.

We're still using mostly the same aircraft selection as we have before
we added squadrons: the closest aircraft is the best choice.

This adds an option to obey the primary task set by the campaign
designer (can be overridden by players), even if the squadron is farther
away than one that is capable of it as a secondary task.

I don't expect this option to live very long. I'm making it optional for
now to give people a chance to test it, but it'll either replace the old
selection strategy or will be removed.

Fixes https://github.com/dcs-liberation/dcs_liberation/issues/1892.

qt_ui/windows/SquadronDialog.py

@@ -26,6 +26,7 @@ from game.theater import ConflictTheater, ControlPoint
 from qt_ui.delegates import TwoColumnRowDelegate
 from qt_ui.errorreporter import report_errors
 from qt_ui.models import AtoModel, SquadronModel
+from qt_ui.widgets.combos.primarytaskselector import PrimaryTaskSelector
 
 
 class PilotDelegate(TwoColumnRowDelegate):
@@ -161,8 +162,20 @@ class SquadronDialog(QDialog):
         columns = QHBoxLayout()
         layout.addLayout(columns)
 
+        left_column = QVBoxLayout()
+        columns.addLayout(left_column)
+
+        left_column.addWidget(QLabel("Primary task"))
+        self.primary_task_selector = PrimaryTaskSelector.for_squadron(
+            self.squadron_model.squadron
+        )
+        self.primary_task_selector.currentIndexChanged.connect(
+            self.on_task_index_changed
+        )
+        left_column.addWidget(self.primary_task_selector)
+
         auto_assigned_tasks = AutoAssignedTaskControls(squadron_model)
-        columns.addLayout(auto_assigned_tasks)
+        left_column.addLayout(auto_assigned_tasks)
 
         self.pilot_list = PilotList(squadron_model)
         self.pilot_list.selectionModel().selectionChanged.connect(
@@ -298,3 +311,9 @@ class SquadronDialog(QDialog):
         index = selected.indexes()[0]
         self.reset_ai_toggle_state(index)
         self.reset_leave_toggle_state(index)
+
+    def on_task_index_changed(self, index: int) -> None:
+        task = self.primary_task_selector.itemData(index)
+        if task is None:
+            raise RuntimeError("Selected task cannot be None")
+        self.squadron.primary_task = task