[Minor] Auto Target Fix - Prioritize checking if the target is dead

CREDITS.md

@@ -394,6 +394,7 @@ This page lists all the individual contributions to the project by their author.
   - Health bar permanently displayed
   - Unlimbo Detonate warhead
   - Fast access structure
+  - The target of death is excluded from automatic target selection
 - **NetsuNegi**:
   - Forbidding parallel AI queues by type
   - Jumpjet crash speed fix when crashing onto building

docs/Fixed-or-Improved-Logics.md

@@ -266,6 +266,7 @@ This page describes all ingame logics that are fixed or improved in Phobos witho
 - Fixed an issue that infantry walking through a cell containing a tree would cause it to be impassable to other houses.
 - Fixed the bug that techno unit will draw with ironcurtain and airstrike color and intensity who disguised as terrain or overlay.
 - Fixed an issue that the AI would enter a combat state when its building receiving damage from friendly units or damage not greater than 0.
+- The target of death is excluded from automatic target selection.
 
 ## Fixes / interactions with other extensions
 

docs/Whats-New.md

@@ -479,6 +479,7 @@ Vanilla fixes:
 - Fixed an issue that infantry walking through a cell containing a tree would cause it to be impassable to other houses (by TaranDahl)
 - Fixed the bug that techno unit will draw with ironcurtain and airstrike color and intensity who disguised as terrain or overlay (by NetsuNegi)
 - Fixed an issue that the AI would enter a combat state when its building receiving damage from friendly units or damage not greater than 0 (by TaranDahl)
+- The target of death is excluded from automatic target selection (by FlyStar)
 
 Phobos fixes:
 - Fixed the bug that `AllowAirstrike=no` cannot completely prevent air strikes from being launched against it (by NetsuNegi)

src/Misc/Hooks.BugFixes.cpp

@@ -2744,3 +2744,36 @@ DEFINE_HOOK(0x44242A, BuildingClass_ReceiveDamage_SetLATime, 0x8)
 }
 
 #pragma endregion
+
+#pragma region CanAutoTargetFix
+
+DEFINE_JUMP(LJMP, 0x6F7D88, 0x6F7DA9)	// They should be placed at the front.
+
+DEFINE_HOOK_AGAIN(0x6F8B56, TechnoClass_CheckAutoTargetObject_OnMap, 0x5)	// TechnoClass::TryAutoTargetObject
+DEFINE_HOOK_AGAIN(0x6F9C89, TechnoClass_CheckAutoTargetObject_OnMap, 0x8)	// TechnoClass::SelectAutoTargetObject_TechnoClass.Array
+DEFINE_HOOK_AGAIN(0x6F9B9C, TechnoClass_CheckAutoTargetObject_OnMap, 0x8)	// TechnoClass::SelectAutoTargetObject_AircraftClass.Array
+DEFINE_HOOK(0x6F91F2, TechnoClass_CheckAutoTargetObject_OnMap, 0x9)			// TechnoClass::SelectAutoTargetObject_AircraftTrackerClass
+{
+	const DWORD address = R->Origin();
+	TechnoClass* const pTarget = (address == 0x6F91F2 || address == 0x6F8B56) ?
+		R->EBP<TechnoClass*>() : R->EDI<TechnoClass*>();
+
+	if (!pTarget->IsAlive || pTarget->Health <= 0 || pTarget->InLimbo)
+	{
+		switch (address)
+		{
+		case 0x6F91F2:
+			return 0x6F9377;
+		case 0x6F9B9C:
+			return 0x6F9C48;
+		case 0x6F8B56:
+			return 0x6F8C07;
+		default:
+			return 0x6F9D93;
+		}
+	}
+
+	return 0;
+}
+
+#pragma endregion