fix(Movement): water super jump bug (#5252)

Changed KinematicCharacterMover so that water super jump bug is stopped.
Closes #5198

engine/src/main/java/org/terasology/engine/logic/characters/KinematicCharacterMover.java

@@ -162,12 +162,13 @@ private void checkMode(final CharacterMovementComponent movementComp, final Char
  Vector3f top = new Vector3f(worldPos);
  Vector3f bottom = new Vector3f(worldPos);
  top.y += 0.5f * movementComp.height;
- bottom.y -= 0.5f * movementComp.height;
+ bottom.y -= 0.25f * movementComp.height;
 
  final boolean topUnderwater = worldProvider.getBlock(top).isLiquid();
  final boolean bottomUnderwater = worldProvider.getBlock(bottom).isLiquid();
 
- final boolean newSwimming = !topUnderwater && bottomUnderwater;
+ //We check if either a single point is in water (SWIMMING) or if both points are in water (DIVING).
+ final boolean newSwimming = !topUnderwater && bottomUnderwater || topUnderwater && !bottomUnderwater;
  final boolean newDiving = topUnderwater && bottomUnderwater;
  boolean newClimbing = false;
 
@@ -650,7 +651,7 @@ private void walk(final CharacterMovementComponent movementComp, final Character
  endVelocity.y = 0;
 
  // Jumping is only possible, if the entity is standing on ground
- if (input.isJumping()) {
+ if (input.isJumping() && state.isGrounded()) {
 
  state.setGrounded(false);