Remove front line minimum distance.

This isn't what it says. It doesn't enforce a minimum distance between
points, but a minimum path length, which isn't useful and isn't a
documented requirement.

cherry-pick from c844c364

changelog.md

@@ -18,6 +18,7 @@ Saves from 5.0.0 are compatible with 5.1.0
 * **[Mission Generation]** Fixed mission scripting error when using a dedicated server.
 * **[Mission Generation]** Fixed an issue where empty convoys lead to an index error when a point capture made a pending transfer of units not completable anymore.
 * **[Mission Generation]** Corrected Viggen FR22 & FR24 preset channels for the DCS 2.7.9 update
+* **[Mission Generation]** Fixed an issue which prevented the mission generation if two controlpoints are really close to each other (e.g. Marianas campaigns)
 * **[UI]** Enable / Disable the settings, save and stats actions if no game is loaded to prevent an error as these functions can only be used on a valid game.
 
 # 5.0.0

game/theater/frontline.py

@@ -14,9 +14,6 @@ from .controlpoint import (
 from ..utils import Heading, pairwise
 
 
-FRONTLINE_MIN_CP_DISTANCE = 5000
-
-
 @dataclass
 class FrontLineSegment:
     """
@@ -172,23 +169,8 @@ class FrontLine(MissionTarget):
         """
         total_strength = self.blue_cp.base.strength + self.red_cp.base.strength
         if self.blue_cp.base.strength == 0:
-            return self._adjust_for_min_dist(0)
+            return 0
         if self.red_cp.base.strength == 0:
-            return self._adjust_for_min_dist(self.attack_distance)
+            return self.attack_distance
         strength_pct = self.blue_cp.base.strength / total_strength
-        return self._adjust_for_min_dist(strength_pct * self.attack_distance)
-
-    def _adjust_for_min_dist(self, distance: float) -> float:
-        """
-        Ensures the frontline conflict is never located within the minimum distance
-        constant of either end control point.
-        """
-        if (distance > self.attack_distance / 2) and (
-            distance + FRONTLINE_MIN_CP_DISTANCE > self.attack_distance
-        ):
-            distance = self.attack_distance - FRONTLINE_MIN_CP_DISTANCE
-        elif (distance < self.attack_distance / 2) and (
-            distance < FRONTLINE_MIN_CP_DISTANCE
-        ):
-            distance = FRONTLINE_MIN_CP_DISTANCE
-        return distance
+        return strength_pct * self.attack_distance