Core/Movement: interrupt a creature's current cast when fleeing for assistance, and (if spell is not castable while moving) when running random/fleeing movement generators. (#17271)

Also make sure the creature is alive before updating.

Fixes #12823.
(cherry picked from commit 2db9269ec1c06b5fccc45dc0a5b4f714f9b48804)

DB/Creature: World Trigger (Not Immune NPC) InhabitType update

Closes #17332 by Malcrom
(cherry picked from commit 78d08834c0afe0be09e4ec071a6e6855aa18e2c8)

DB/Item: Fix text in Rune-Inscribed Parchment

Closes #17329 by tkrokli
(cherry picked from commit 8879545f21fe13650872358741b687a524cf8cb9)

DB/Quest: improve chaining for "The Ashenvale Hunt" quests

Closes #17323 by SnapperRy
(cherry picked from commit d034eedb811912546025d11a5e9335bcd6600464)

DB/trinity_string: wrong string about character customization + minor fix

Closes #17306 by lyn1337
(cherry picked from commit 0951e559ebe6b76abdfef55619244578d9917002)

DB/Quest: fix some completion/offer reward quest texts

Closes #17336 by SnapperRy
(cherry picked from commit e9025036b9848a5a684c57e3e066687c29fde321)

DB/Quest: add queststarters for "Regthar Deathgate"

Closes #17337 by SnapperRy
(cherry picked from commit 0b8921a0ef81fb7c4741248301b17a86fa0ffb69)

DB/Quest: fix chaining for "The Real Threat"

Closes #17338 by SnapperRy
(cherry picked from commit c9cb86d6c53ceb7331a1a5c1ff8a69f569cca426)

DB/Quest: fix repeatableness (or lack of) for some quests

Closes #17339 by SnapperRy
(cherry picked from commit b9f2e2a81b7f0a269da3a8f9597a4eca17899781)

DB/Quest: improvements for "Fool's Stout"

Closes #17340 by SnapperRy
(cherry picked from commit 4ec753dc50927e358a63a49a56cef7f5a72f41eb)

3 files changed, 16 insertions, 0 deletions

diff --git a/src/server/game/Movement/MotionMaster.cpp b/src/server/game/Movement/MotionMaster.cpp
index 94dcd71b5d5..7c747b9fe82 100644
--- a/src/server/game/Movement/MotionMaster.cpp
+++ b/src/server/game/Movement/MotionMaster.cpp
@@ -528,6 +528,7 @@ void MotionMaster::MoveSeekAssistance(float x, float y, float z)
         TC_LOG_DEBUG("misc", "Creature (Entry: %u %s) seek assistance (X: %f Y: %f Z: %f)",
             _owner->GetEntry(), _owner->GetGUID().ToString().c_str(), x, y, z);
         _owner->AttackStop();
+        _owner->CastStop();
         _owner->ToCreature()->SetReactState(REACT_PASSIVE);
         Mutate(new AssistanceMovementGenerator(x, y, z), MOTION_SLOT_ACTIVE);
     }
diff --git a/src/server/game/Movement/MovementGenerators/FleeingMovementGenerator.cpp b/src/server/game/Movement/MovementGenerators/FleeingMovementGenerator.cpp
index 76b8e29ff78..23d9fac49de 100644
--- a/src/server/game/Movement/MovementGenerators/FleeingMovementGenerator.cpp
+++ b/src/server/game/Movement/MovementGenerators/FleeingMovementGenerator.cpp
@@ -38,6 +38,12 @@ void FleeingMovementGenerator<T>::_setTargetLocation(T* owner)
     if (owner->HasUnitState(UNIT_STATE_ROOT | UNIT_STATE_STUNNED))
         return;
 
+    if (owner->HasUnitState(UNIT_STATE_CASTING) && !owner->CanMoveDuringChannel())
+    {
+        owner->CastStop();
+        return;
+    }
+
     owner->AddUnitState(UNIT_STATE_FLEEING_MOVE);
 
     float x, y, z;
diff --git a/src/server/game/Movement/MovementGenerators/RandomMovementGenerator.cpp b/src/server/game/Movement/MovementGenerators/RandomMovementGenerator.cpp
index 463f9c5e4e9..caa7d513796 100644
--- a/src/server/game/Movement/MovementGenerators/RandomMovementGenerator.cpp
+++ b/src/server/game/Movement/MovementGenerators/RandomMovementGenerator.cpp
@@ -29,6 +29,12 @@
 template<>
 void RandomMovementGenerator<Creature>::_setRandomLocation(Creature* creature)
 {
+    if (creature->HasUnitState(UNIT_STATE_CASTING) && !creature->CanMoveDuringChannel())
+    {
+        creature->CastStop();
+        return;
+    }
+
     float respX, respY, respZ, respO, destX, destY, destZ, travelDistZ;
     creature->GetHomePosition(respX, respY, respZ, respO);
     Map const* map = creature->GetBaseMap();
@@ -141,6 +147,9 @@ void RandomMovementGenerator<Creature>::DoFinalize(Creature* creature)
 template<>
 bool RandomMovementGenerator<Creature>::DoUpdate(Creature* creature, const uint32 diff)
 {
+    if (!creature || !creature->IsAlive())
+        return false;
+
     if (creature->HasUnitState(UNIT_STATE_ROOT | UNIT_STATE_STUNNED | UNIT_STATE_DISTRACTED))
     {
         i_nextMoveTime.Reset(0);  // Expire the timer