Merge pull request #13094 from brave/pr13072_rewards-fix-drag-image-linux-captcha_1.38.x

Fix incorrect CAPTCHA drag image on scaled Linux display (uplift to 1.38.x)

Author: kjozwiak

components/brave_rewards/resources/rewards_panel/components/grant_captcha_challenge.tsx

@@ -39,6 +39,16 @@ export function GrantCaptchaChallenge (props: Props) {
       x: (rect.width / 2) - (event.clientX - rect.left),
       y: (rect.height / 2) - (event.clientY - rect.top)
     })
+
+    // Work around Linux-specific upstream bug by explicitly setting the drag
+    // image offset when initiating the drag
+    // See https://bugs.chromium.org/p/chromium/issues/detail?id=1297990
+    if (window.navigator.userAgent.includes('Linux') && devicePixelRatio > 1) {
+      event.dataTransfer.setDragImage(
+        target,
+        event.clientX - rect.left,
+        event.clientY - rect.top)
+    }
   }
 
   function onDragOver (event: React.DragEvent) {