Allow player to be pushed off moving blocks

tests/test_crush.py

@@ -113,6 +113,46 @@ traps:
     assert g.player.rect.x < start_x          # got shoved along
 
 
+def test_ride_into_wall_stops_no_crush(make_game):
+    # Riding a horizontally-moving platform into a stationary wall must NOT
+    # crush the player: they stop at the wall while the block slides underneath.
+    # The wall sits one row *above* the platform's track (col 8, row 2), so it
+    # catches the player's body while the platform passes below it.
+    g = make_game("""
+name: t
+tile_size: 32
+map: |
+  ###########
+  #.........#
+  #.......#.#
+  #.........#
+  #........G#
+  ###########
+traps:
+  - type: block
+    at: [1, 3]
+    move: [8, 0]
+    speed: 200
+    trigger: always
+""")
+    # stand the player on top of the platform at its left end (body in row 2)
+    place(g, 1, 2)
+    g.player.fy = float(3 * 32 - g.player.h)   # feet on the block's top
+    g.player._sync_rect()
+    wall_left = 8 * 32
+    hit_wall = False
+    for _ in range(180):
+        step(g)
+        if g.state != "playing":
+            break
+        assert not g.player.crushed                    # never crushed
+        assert g.player.rect.right <= wall_left + 1     # stopped at the wall
+        if g.player.rect.right >= wall_left - 1:
+            hit_wall = True
+    assert g.state == "playing"                        # survived the whole time
+    assert hit_wall                                    # actually reached the wall
+
+
 def test_corner_clip_does_not_warp(make_game):
     # Walking into a moving block near its corner must not fling the player
     # across it (the old velocity-sign resolver bug).