Core/Movement: Add new flag MOVEMENTGENERATOR_FLAG_PERSIST_ON_DEATH (#26549)

* Core/Movement: Add new flag MOVEMENTGENERATOR_FLAG_PERSIST_ON_DEATH

Add new flag MOVEMENTGENERATOR_FLAG_PERSIST_ON_DEATH to keep movement generators even after death.

Fixes #23095
Could replace ff26027453179448bb972d88a51e565d71e95f3f

* Core/Movement: reorder new method MotionMaster::StopOnDeath

* Core/Movement: reorder new method MotionMaster::StopOnDeath

* Keep MoveJump movement generator after death

Co-authored-by: ccrs <ccrs@users.noreply.github.com>
(cherry picked from commit 9fe9dc087b4dc52af7897942a83c1f880d3a4ef8)

1 files changed, 24 insertions, 0 deletions

diff --git a/src/server/game/Movement/MotionMaster.cpp b/src/server/game/Movement/MotionMaster.cpp
index d9df89b116f..b0a8aa1fa70 100644
--- a/src/server/game/Movement/MotionMaster.cpp
+++ b/src/server/game/Movement/MotionMaster.cpp
@@ -544,6 +544,28 @@ bool MotionMaster::GetDestination(float &x, float &y, float &z)
     return true;
 }
 
+bool MotionMaster::StopOnDeath()
+{
+    if (MovementGenerator* movementGenerator = GetCurrentMovementGenerator())
+        if (movementGenerator->HasFlag(MOVEMENTGENERATOR_FLAG_PERSIST_ON_DEATH))
+            return false;
+
+    if (_owner->IsInWorld())
+    {
+        // Only clear MotionMaster for entities that exists in world
+        // Avoids crashes in the following conditions :
+        //  * Using 'call pet' on dead pets
+        //  * Using 'call stabled pet'
+        //  * Logging in with dead pets
+        Clear();
+        MoveIdle();
+    }
+
+    _owner->StopMoving();
+
+    return true;
+}
+
 void MotionMaster::MoveIdle()
 {
     Add(GetIdleMovementGenerator(), MOTION_SLOT_DEFAULT);
@@ -766,6 +788,7 @@ void MotionMaster::MoveKnockbackFrom(Position const& origin, float speedXY, floa
 
     GenericMovementGenerator* movement = new GenericMovementGenerator(std::move(init), EFFECT_MOTION_TYPE, 0);
     movement->Priority = MOTION_PRIORITY_HIGHEST;
+    movement->AddFlag(MOVEMENTGENERATOR_FLAG_PERSIST_ON_DEATH);
     Add(movement);
 }
 
@@ -853,6 +876,7 @@ void MotionMaster::MoveJumpWithGravity(Position const& pos, float speedXY, float
     GenericMovementGenerator* movement = new GenericMovementGenerator(std::move(init), EFFECT_MOTION_TYPE, id, arrivalSpellId, arrivalSpellTargetGuid);
     movement->Priority = MOTION_PRIORITY_HIGHEST;
     movement->BaseUnitState = UNIT_STATE_JUMPING;
+    movement->AddFlag(MOVEMENTGENERATOR_FLAG_PERSIST_ON_DEATH);
     Add(movement);
 }