fix: account for OS scaling during mouse movement

Closes #27.

src/background/main.js

@@ -149,6 +149,8 @@ async function onMessage(request, sender) {
     await resetCaptcha(sender.tab.id, sender.frameId, request.challengeUrl);
   } else if (request.id === 'getFramePos') {
     return getFramePos(sender.tab.id, sender.frameId, request.index);
+  } else if (request.id === 'getTabZoom') {
+    return browser.tabs.getZoom(sender.tab.id);
   } else if (request.id === 'startNativeApp') {
     nativePort = browser.runtime.connectNative('org.buster.client');
   } else if (request.id === 'stopNativeApp') {

src/solve/main.js

@@ -184,15 +184,17 @@ async function sendNativeMessage(message) {
 async function getBrowserBorder(clickEvent) {
   const framePos = await getFrameClientPos();
   const scale = window.devicePixelRatio;
+  const zoom = await browser.runtime.sendMessage({id: 'getTabZoom'});
+  const osScale = scale / zoom;
 
   return {
     left:
-      clickEvent.screenX -
+      clickEvent.screenX * osScale -
       clickEvent.clientX * scale -
       framePos.x -
       window.screenX * scale,
     top:
-      clickEvent.screenY -
+      clickEvent.screenY * osScale -
       clickEvent.clientY * scale -
       framePos.y -
       window.screenY * scale