[v2] fix: simplify DragAndDrop fix - remove OnDomReady suppression

The previous fix was over-engineered. It suppressed OnDomReady events
on all platforms to prevent multiple calls during file drops. However,
users may have legitimate use cases for OnDomReady being called on
navigation/reload.

This simplified fix:
- Keeps the JavaScript setup() that runs on each DOM load to register
  drag handlers early (preventing browser navigation on file drops)
- Keeps the Windows AllowExternalDrag fix for EnableFileDrop+DisableWebViewDrop
- Removes the OnDomReady suppression on macOS, Linux, and Windows

The core insight is that by preventing browser navigation on file drops
via JavaScript, the page won't reload, so OnDomReady won't fire extra
times in the problematic scenario anyway.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

v2/internal/frontend/desktop/darwin/WailsContext.h

@@ -50,7 +50,6 @@
 
 @property bool devtoolsEnabled;
 @property bool defaultContextMenuEnabled;
-@property bool domReadySent;
 
 @property (retain) WKUserContentController* userContentController;
 

v2/internal/frontend/desktop/darwin/WailsContext.m

@@ -473,12 +473,7 @@ typedef void (^schemeTaskCaller)(id<WKURLSchemeTask>);
 }
 
 - (void)webView:(WKWebView *)webView didFinishNavigation:(WKNavigation *)navigation {
-    // Only send DomReady once to prevent OnDomReady callback from being called
-    // multiple times (e.g., on navigation or page reload)
-    if (!self.domReadySent) {
-        self.domReadySent = YES;
-        processMessage("DomReady");
-    }
+    processMessage("DomReady");
 }
 
 - (void)userContentController:(nonnull WKUserContentController *)userContentController didReceiveScriptMessage:(nonnull WKScriptMessage *)message {

v2/internal/frontend/desktop/linux/window.c

@@ -469,20 +469,11 @@ gboolean UnFullscreen(gpointer data)
     return G_SOURCE_REMOVE;
 }
 
-// Flag to track if DomReady has been sent - ensures OnDomReady callback is only called once
-static gboolean domReadySent = FALSE;
-
 static void webviewLoadChanged(WebKitWebView *web_view, WebKitLoadEvent load_event, gpointer data)
 {
     if (load_event == WEBKIT_LOAD_FINISHED)
     {
-        // Only send DomReady once to prevent OnDomReady callback from being called
-        // multiple times (e.g., on navigation or page reload)
-        if (!domReadySent)
-        {
-            domReadySent = TRUE;
-            processMessage("DomReady");
-        }
+        processMessage("DomReady");
     }
 }
 

v2/internal/frontend/desktop/windows/frontend.go

@@ -907,6 +907,10 @@ func (f *Frontend) ExecJS(js string) {
 }
 
 func (f *Frontend) navigationCompleted(sender *edge.ICoreWebView2, args *edge.ICoreWebView2NavigationCompletedEventArgs) {
+	if f.frontendOptions.OnDomReady != nil {
+		go f.frontendOptions.OnDomReady(f.ctx)
+	}
+
 	if f.frontendOptions.Frameless && f.frontendOptions.DisableResize == false {
 		f.ExecJS("window.wails.flags.enableResize = true;")
 	}
@@ -920,12 +924,6 @@ func (f *Frontend) navigationCompleted(sender *edge.ICoreWebView2, args *edge.IC
 	}
 	f.hasStarted = true
 
-	// Only call OnDomReady on the first navigation completion to prevent
-	// multiple calls when page reloads or navigates (e.g., during file drops)
-	if f.frontendOptions.OnDomReady != nil {
-		go f.frontendOptions.OnDomReady(f.ctx)
-	}
-
 	// Hack to make it visible: https://github.com/MicrosoftEdge/WebView2Feedback/issues/1077#issuecomment-825375026
 	err := f.chromium.Hide()
 	if err != nil {

v2/internal/frontend/runtime/desktop/draganddrop.js

@@ -14,7 +14,6 @@ import {EventsOn, EventsOff} from "./events";
 
 const flags = {
     registered: false,
-    handlersSetup: false,
     defaultUseDropTarget: true,
     useDropTarget: true,
     nextDeactivate: null,
@@ -247,9 +246,6 @@ export function OnFileDrop(callback, useDropTarget) {
     const uDTPT = typeof useDropTarget;
     flags.useDropTarget = uDTPT === "undefined" || uDTPT !== "boolean" ? flags.defaultUseDropTarget : useDropTarget;
 
-    // Ensure handlers are set up (idempotent - safe to call multiple times)
-    setup();
-
     let cb = callback;
     if (flags.useDropTarget) {
         cb = function (x, y, paths) {
@@ -277,16 +273,13 @@ export function OnFileDropOff() {
 }
 
 /**
- * setup installs the drag and drop handlers early to prevent browser navigation
+ * setup installs the drag and drop handlers to prevent browser navigation
  * when files are dropped. This is called from the runtime initialization to ensure
  * handlers are in place before the user has a chance to drop files.
  * The actual file processing only happens when enableWailsDragAndDrop flag is true.
+ * This runs on every DOM load to ensure handlers are always registered.
  */
 export function setup() {
-    if (flags.handlersSetup) {
-        return;
-    }
-    flags.handlersSetup = true;
     window.addEventListener('dragover', onDragOver);
     window.addEventListener('dragleave', onDragLeave);
     window.addEventListener('drop', onDrop);