Fix Discourse support.

src/js/content.js

@@ -3,6 +3,11 @@ let shiftPressed = false;
 const isFirefox = navigator.userAgent.toLowerCase().includes('firefox');
 
 function pasteHandler(event) {
+	// We have to wait until the paste event to detect Discourse.
+	if (document.querySelectorAll('.discourse-root').length > 0) {
+		return;
+	}
+
 	if (shiftPressed) {
 		return;
 	}
@@ -186,11 +191,6 @@ if (document.body.classList.contains('o2')) {
 	attach = false;
 }
 
-// No need to load in Discourse, as it already has this feature.
-if (document.querySelectorAll('.discourse-root').length > 0) {
-	attach = false;
-}
-
 if (attach) {
 	document.addEventListener('paste', pasteHandler);
 	document.addEventListener('keydown', shiftChecker);