Update the movement tracking flags in the GM client, becauase the user isn't allowed to modify them

module.json

@@ -13,7 +13,8 @@
 		}
 	],
 	"esmodules": [
-		"src/main.js"
+		"src/main.js",
+		"src/socket.js"
 	],
 	"templates": [
 		"speed_provider_settings.html"
@@ -40,6 +41,13 @@
 			"path": "lang/zh-tw.json"
 		}
 	],
+	"dependencies": [
+		{
+			"name": "socketlib",
+			"manifest": "https://raw.githubusercontent.com/manuelVo/foundryvtt-socketlib/master/module.json"
+		}
+	],
+	"socket": true,
 	"url": "https://github.com/manuelVo/foundryvtt-drag-ruler",
 	"download": "https://github.com/manuelVo/foundryvtt-drag-ruler/archive/v1.4.6.zip",
 	"manifest": "https://raw.githubusercontent.com/manuelVo/foundryvtt-drag-ruler/master/module.json",

src/movement_tracking.js

@@ -1,4 +1,5 @@
 import {measureDistances} from "./compatibility.js";
+import {updateCombatantDragRulerFlags} from "./socket.js";
 import {getTokenShape} from "./util.js";
 
 function initTrackingFlag(combatant) {
@@ -54,7 +55,7 @@ export async function trackRays(token, rays) {
 			waypoints.push(ray.A);
 		}
 	}
-	await combat.updateEmbeddedEntity("Combatant", {_id: combatant._id, flags: combatant.flags}, {diff: false});
+	await updateCombatantDragRulerFlags(combat, combatant, dragRulerFlags);
 }
 
 export function getMovementHistory(token) {

src/socket.js

@@ -0,0 +1,17 @@
+let socket;
+
+Hooks.once("socketlib.ready", () => {
+	socket = socketlib.registerModule("drag-ruler");
+	socket.register("updateCombatantDragRulerFlags", _socketUpdateCombatantDragRulerFlags);
+});
+
+export async function updateCombatantDragRulerFlags(combat, combatant, flags) {
+	const combatId = combat.id;
+	const combatantId = combatant._id;
+	return socket.executeAsGM(_socketUpdateCombatantDragRulerFlags, combatId, combatantId, flags);
+}
+
+async function _socketUpdateCombatantDragRulerFlags(combatId, combatantId, flags) {
+	const combat = game.combats.get(combatId);
+	return combat.updateEmbeddedEntity("Combatant", {_id: combatantId, flags: {dragRuler: flags}}, {diff: false});
+}