Fix zeekling jittering after death (#3378)

* Fix Zeekling jittering after death

Fixes #3353

* Do not set badguy's x-velocity to zero if ignited or squished in air

* Fix WalkingBadguy handling when inactive

Author: Brockengespenst

src/badguy/badguy.cpp

@@ -720,7 +720,11 @@ BadGuy::kill_squished(GameObject& object)
 
   SoundManager::current()->play("sounds/squish.wav", get_pos());
   m_physic.enable_gravity(true);
-  m_physic.set_velocity(0, 0);
+
+  if (on_ground())
+    m_physic.set_velocity(0, 0);
+  else
+    m_physic.set_velocity_y(0.0f);
   set_state(STATE_SQUISHED);
   set_group(COLGROUP_MOVING_ONLY_STATIC);
   auto player = dynamic_cast<Player*>(&object);
@@ -1194,7 +1198,12 @@ BadGuy::ignite()
     unfreeze();
 
   m_physic.enable_gravity(true);
-  m_physic.set_velocity(0, 0);
+
+  if (on_ground())
+    m_physic.set_velocity(0, 0);
+  else
+    m_physic.set_velocity_y(0.0f);
+
   set_group(COLGROUP_MOVING_ONLY_STATIC);
   m_sprite->stop_animation();
   m_ignited = true;

src/badguy/bouncing_snowball.cpp

@@ -131,15 +131,16 @@ BouncingSnowball::collision_squished(MovingObject& object)
 void
 BouncingSnowball::collision_solid(const CollisionHit& hit)
 {
-  if (m_sprite->get_action() == "squished")
-    return;
-
-  if (m_frozen)
+  if (m_frozen || !is_active())
   {
     BadGuy::collision_solid(hit);
     return;
   }
 
+  if (m_sprite->get_action() == "squished")
+    return;
+
+
   if (hit.bottom) {
     if (get_state() == STATE_ACTIVE) {
       float bounce_speed = -m_physic.get_velocity_y()*0.8f;

src/badguy/walking_badguy.cpp

@@ -187,7 +187,7 @@ WalkingBadguy::collision_solid(const CollisionHit& hit)
 
   update_on_ground_flag(hit);
 
-  if (m_frozen)
+  if (m_frozen || !is_active())
   {
     BadGuy::collision_solid(hit);
     return;

src/badguy/zeekling.cpp

@@ -104,18 +104,12 @@ Zeekling::on_bump_vertical()
 void
 Zeekling::collision_solid(const CollisionHit& hit)
 {
-  if (m_frozen)
+  if (m_frozen || !is_active())
   {
     BadGuy::collision_solid(hit);
     return;
   }
 
-  if (BadGuy::get_state() == STATE_SQUISHED ||
-      BadGuy::get_state() == STATE_BURNING)
-  {
-    return;
-  }
-
   if (hit.top || hit.bottom)
     on_bump_vertical();
   else if (hit.left || hit.right)