Fix keyboard input not working on Windows client

Added explicit window focus grab after connecting (lan-bootstrapper.gd)
so keyboard input is properly received by the input system.
Also added diagnostic debug prints to trace input pipeline.

examples/multiplayer-fps/scripts/player-input.gd

@@ -75,12 +75,16 @@ func _input(event: InputEvent) -> void:
 
 func _gather():
 	if !is_setup:
+		print("[INPUT DEBUG] _gather first call - setting up")
 		setup()
-
+	
 	# Movement (continuous)
 	var mx = Input.get_axis("move_west", "move_east")
 	var mz = Input.get_axis("move_north", "move_south")
+	var old_mv = movement
 	movement = Vector3(mx, 0, mz)
+	if movement != old_mv and (mx != 0 or mz != 0):
+		print("[INPUT DEBUG] _gather movement=%s (mx=%.2f mz=%.2f)" % [movement, mx, mz])
 
 	jump = Input.is_action_pressed("move_jump")
 

examples/multiplayer-fps/scripts/player.gd

@@ -123,21 +123,30 @@ func _after_tick_loop():
 func _process(_delta: float):
 	if not _is_local:
 		if input.is_multiplayer_authority():
+			print("[PLAYER DEBUG] First _process — calling _setup_local_camera (authority: %d)" % multiplayer.get_unique_id())
 			_setup_local_camera()
 		else:
+			print("[PLAYER DEBUG] _process skipping — input not authority (unique_id=%d, input_auth=%d)" % [multiplayer.get_unique_id(), input.get_multiplayer_authority()])
 			return
-
+	
 	# Smooth position interpolation between ticks
 	var f := NetworkTime.tick_factor
 	global_position = _lerp_from_pos.lerp(_lerp_to_pos, f)
-
+	
 	# Frame-rate mouse look (recoil only affects raycast, not camera)
+	var old_yaw = _sim_yaw
 	rotation.y = _sim_yaw + (-input.mouse_rotation.y)
+	if _sim_yaw != old_yaw or input.mouse_rotation.length_squared() > 0:
+		pass  # mouse look active
 	head.rotation.x = clamp(_sim_pitch + (-input.mouse_rotation.x), -1.57, 1.57)
 	head.rotation.y = 0
 	head.rotation.z = 0
 
 func _rollback_tick(delta: float, tick: int, is_fresh: bool) -> void:
+	# DEBUG movement state
+	if input and input.movement.length_squared() > 0:
+		print("[PLAYER RT] tick=%d movement=%s hp=%d death_tick=%d frozen=%s" % [tick, input.movement, health, death_tick, round_manager and round_manager.freeze_end_tick >= 0 and tick < round_manager.freeze_end_tick])
+
 	# Handle round respawn teleport inside rollback
 	if respawn_tick >= 0 and tick == respawn_tick:
 		global_position = respawn_position

examples/multiplayer-fps/scripts/weapon_manager.gd

@@ -26,7 +26,7 @@ var _pending_grenades: Array[Dictionary] = []  # Buffered throws, consumed in _a
 
 # Weapon models (loaded at runtime)
 var _knife_model: Node3D
-var _gun_model: MeshInstance3D
+var _gun_model: Node3D
 var _grenade_model: Node3D
 var _current_visible_slot: int = -1
 var _knife_sound: AudioStreamPlayer3D
@@ -161,6 +161,10 @@ func _rollback_tick(delta: float, tick: int, _is_fresh: bool):
 	if rollback_synchronizer.is_predicting():
 		return
 
+	# DEBUG: weapon switching
+	if input and (input.slot_1 or input.slot_2 or input.slot_3 or input.slot_4):
+		print("[WEAPON DEBUG] _rollback_tick tick=%d slots=[s1=%s s2=%s s3=%s s4=%s] active=%d inv=%s" % [tick, input.slot_1, input.slot_2, input.slot_3, input.slot_4, active_slot, inventory])
+
 	# Skip if player dead
 	if player.death_tick >= 0 and tick >= player.death_tick:
 		return
@@ -406,3 +410,8 @@ func _spawn_grenade(origin: Vector3, direction: Vector3, owner_id: int, type_idx
 	get_tree().current_scene.add_child(grenade)
 	var gtype: Grenade.GrenadeType = Grenade.GrenadeType.FLASH if type_idx == 0 else Grenade.GrenadeType.SMOKE
 	grenade.setup(origin, direction, owner_id, gtype)
+
+func _rollback_tick(delta: float, tick: int, _is_fresh: bool):
+    # DEBUG: Log when this is called with non-default input
+    if input and (input.slot_1 or input.slot_2 or input.slot_3 or input.slot_4):
+        print("[WEAPON DEBUG] _rollback_tick tick=%d slots=[%s %s %s %s]" % [tick, input.slot_1, input.slot_2, input.slot_3, input.slot_4])

examples/shared/scripts/lan-bootstrapper.gd

@@ -72,6 +72,9 @@ func join():
 	print("Client started")
 	connect_ui.hide()
 	
+	# Ensure game window has keyboard focus for input
+	get_window().grab_focus()
+	
 	# Only start manually if NetworkEvents is not handling it (e.g. multiplayer-simple)
 	if not NetworkEvents.enabled:
 		NetworkTime.start()
@@ -80,8 +83,14 @@ func _enter_tree():
 	# Hide and show UI as appropriate
 	# These handlers are necessary, since the game could have started via
 	# autoconnect, or any other method
-	NetworkEvents.on_client_start.connect(func(__): connect_ui.hide())
+	NetworkEvents.on_client_start.connect(func(__):
-	NetworkEvents.on_server_start.connect(func(): connect_ui.hide())
+		connect_ui.hide()
+		get_window().grab_focus()
+	)
+	NetworkEvents.on_server_start.connect(func():
+		connect_ui.hide()
+		get_window().grab_focus()
+	)
 	NetworkEvents.on_client_stop.connect(func(): connect_ui.show())
 	NetworkEvents.on_server_stop.connect(func(): connect_ui.show())
 

tests/check_actions.gd.uid

@@ -0,0 +1 @@
+uid://4mlr8ca8nlg7

tests/check_input_map.gd.uid

@@ -0,0 +1 @@
+uid://h5lroui7prfv

tests/check_models.gd.uid

@@ -0,0 +1 @@
+uid://c2m50xd561do8