Core/Spells: Fixed fishing broken in a recent commit

src/server/game/Spells/Spell.cpp

@@ -1414,7 +1414,26 @@ void Spell::SelectImplicitCasterDestTargets(SpellEffIndex effIndex, SpellImplici
              float x, y, z, angle;
              angle = (float)rand_norm() * static_cast<float>(M_PI * 35.0f / 180.0f) - static_cast<float>(M_PI * 17.5f / 180.0f);
              m_caster->GetClosePoint(x, y, z, DEFAULT_WORLD_OBJECT_SIZE, dis, angle);
-             m_targets.SetDst(x, y, z, m_caster->GetOrientation());
+
+             float ground = z;
+             float liquidLevel = m_caster->GetMap()->GetWaterOrGroundLevel(x, y, z, &ground);
+             if (liquidLevel <= ground) // When there is no liquid Map::GetWaterOrGroundLevel returns ground level
+             {
+                 SendCastResult(SPELL_FAILED_NOT_HERE);
+                 SendChannelUpdate(0);
+                 finish(false);
+                 return;
+             }
+
+             if (ground + 0.75 > liquidLevel)
+             {
+                 SendCastResult(SPELL_FAILED_TOO_SHALLOW);
+                 SendChannelUpdate(0);
+                 finish(false);
+                 return;
+             }
+
+             m_targets.SetDst(x, y, liquidLevel, m_caster->GetOrientation());
              return;
         }
         default: