Fix refocusing clearing existing forcus for iframe based webviews

#83188

src/vs/workbench/contrib/webview/browser/pre/main.js

@@ -439,10 +439,18 @@
 
 			// propagate focus
 			host.onMessage('focus', () => {
-				const target = getActiveFrame();
-				if (target) {
-					target.contentWindow.focus();
+				const activeFrame = getActiveFrame();
+				if (!activeFrame || !activeFrame.contentWindow) {
+					return;
+				}
+
+				if (document.activeElement === activeFrame) {
+					// We are already focused on the iframe (or one of its children) so no need
+					// to refocus.
+					return;
 				}
+
+				activeFrame.contentWindow.focus();
 			});
 
 			// update iframe-contents
@@ -573,6 +581,8 @@
 							newFrame.contentWindow.focus();
 						}
 
+
+
 						contentWindow.addEventListener('scroll', handleInnerScroll);
 						contentWindow.addEventListener('wheel', handleWheel);