Merge branch 'lboklin/prevent-full-stop-from-drag' into 'master'

Prevent drag forces from causing something to come to a complete stop

See merge request veloren/veloren!2170

common/systems/src/phys.rs

@@ -86,7 +86,9 @@ fn integrate_forces(
             // This way we can only ever lose velocity and will never experience a reverse
             // in direction from events such as falling into water at high velocities.
             if new_v.dot(vel.0) < 0.0 {
-                vel.0 -= vel.0.projected(&impulse);
+                // Multiply by a factor to prevent full stop, as this can cause things to get
+                // stuck in high-density medium
+                vel.0 -= vel.0.projected(&impulse) * 0.7;
             } else {
                 vel.0 = new_v;
             }