Fix Lynx force floor compat switch; ensure monsters can't turn in traps

js/defs.js

@@ -181,8 +181,8 @@ export const COMPAT_FLAGS = [
     label: "Player can't override backwards on a force floor",
     rulesets: new Set(['lynx']),
 }, {
-    key: 'force_floor_only_on_arrive',
+    key: 'force_floors_inert_on_first_tic',
-    label: "Force floors only affect actors when stepped on",
+    label: "Force floors don't trigger on the first tic",
     rulesets: new Set(['lynx', 'ms']),
 }, {
     key: 'traps_like_lynx',

js/game.js

@@ -837,13 +837,13 @@ export class Level extends LevelInterface {
     // only be made every third frame
     _advance_tic_lynx60() {
         this._do_decision_phase(true);
-        this._do_combined_action_phase(1, true);
+        this._do_combined_action_phase(1);
         this._do_post_actor_phase();
         this._do_wire_phase();
 
         this.frame_offset = 1;
         this._do_decision_phase(true);
-        this._do_combined_action_phase(1, true);
+        this._do_combined_action_phase(1);
         this._do_post_actor_phase();
         this._do_wire_phase();
 
@@ -869,7 +869,7 @@ export class Level extends LevelInterface {
             let is_decision_frame = this.frame_offset === 2;
 
             this._do_decision_phase(! is_decision_frame);
-            this._do_combined_action_phase(1, ! is_decision_frame);
+            this._do_combined_action_phase(1);
             this._do_post_actor_phase();
             this._do_wire_phase();
 
@@ -996,7 +996,7 @@ export class Level extends LevelInterface {
     }
 
     // Lynx's combined action phase: each actor attempts to move, then cools down, in order
-    _do_combined_action_phase(cooldown, forced_only = false) {
+    _do_combined_action_phase(cooldown) {
         for (let i = this.actors.length - 1; i >= 0; i--) {
             let actor = this.actors[i];
             if (! actor.cell)
@@ -1332,7 +1332,7 @@ export class Level extends LevelInterface {
             return null;
         if (! terrain.type.get_slide_direction)
             return null;
-        if (! actor.is_pending_slide && ! (terrain.type.slide_automatically && ! this.compat.force_floor_only_on_arrive))
+        if (! (actor.is_pending_slide || terrain.type.slide_automatically))
             return null;
         if (actor.ignores(terrain.type.name))
             return null;
@@ -1525,6 +1525,11 @@ export class Level extends LevelInterface {
             // go back into the trap.  this is consistent with CC2 but not ms/lynx
             return;
         }
+        if (this.compat.traps_like_lynx && terrain.type.name === 'trap') {
+            // Lynx traps don't allow actors to turn even while open; instead they get ejected
+            // during their idle step
+            return;
+        }
         if (actor.type.decide_movement) {
             direction_preference = actor.type.decide_movement(actor, this);
         }

js/tiletypes.js

@@ -60,13 +60,13 @@ function _define_force_floor(direction, opposite_type) {
         slide_automatically: true,
         allow_player_override: true,
         get_slide_direction(me, level, other) {
+            if (level.compat.force_floors_inert_on_first_tic && level.tic_counter === 0) {
+                // Lynx: Force floors don't push on the first tic
+                return null;
+            }
             return direction;
         },
         force_floor_direction: direction,
-        on_arrive(me, level, other) {
-            // Necessary for compat.force_floor_only_on_arrive, which disables slide_automatically
-            level._set_tile_prop(other, 'is_pending_slide', true);
-        },
         activate(me, level) {
             level.transmute_tile(me, opposite_type);
         },
@@ -983,16 +983,16 @@ const TILE_TYPES = {
         speed_factor: 2,
         allow_player_override: true,
         get_slide_direction(me, level, _other) {
+            if (level.compat.force_floors_inert_on_first_tic && level.tic_counter === 0) {
+                // Lynx: Force floors don't push on the first tic
+                return null;
+            }
             return level.get_force_floor_direction();
         },
         blocks(me, level, other) {
             return (level.compat.rff_blocks_monsters &&
                 (other.type.collision_mask & COLLISION.monster_typical));
         },
-        on_arrive(me, level, other) {
-            // Necessary for compat.force_floor_only_on_arrive, which disables slide_automatically
-            level._set_tile_prop(other, 'is_pending_slide', true);
-        },
     },
     slime: {
         layer: LAYERS.terrain,
@@ -1528,6 +1528,11 @@ const TILE_TYPES = {
                 level.attempt_out_of_turn_step(other, other.direction);
             }
         },
+        on_stand(me, level, other) {
+            if (level.compat.traps_like_lynx) {
+                level.attempt_out_of_turn_step(other, other.direction);
+            }
+        },
         add_press_ready(me, level, other) {
             // Same as below, but without ejection
             level._set_tile_prop(me, 'presses', (me.presses ?? 0) + 1);