fix(Desktop): Backspace when editing fields (#552)

Co-authored-by: PartyDonut <PartyDonut@users.noreply.github.com>

lib/widgets/shared/back_intent_dpad.dart

@@ -14,27 +14,37 @@ class BackIntentDpad extends StatelessWidget {
     if (AdaptiveLayout.inputDeviceOf(context) == InputDevice.touch) {
       return child;
     }
-    return Shortcuts(
+    return Focus(
-      shortcuts: <LogicalKeySet, Intent>{
+      canRequestFocus: false,
-        LogicalKeySet(LogicalKeyboardKey.backspace): const BackIntent(),
+      onKeyEvent: (FocusNode node, KeyEvent event) {
+        if (event is! KeyDownEvent) {
+          return KeyEventResult.ignored;
+        }
+
+        if (event.logicalKey == LogicalKeyboardKey.backspace) {
+          if (_isEditableTextFocused()) {
+            return KeyEventResult.ignored;
+          } else {
+            context.maybePop();
+            return KeyEventResult.handled;
+          }
+        }
+
+        return KeyEventResult.ignored;
       },
-      child: Actions(
+      child: child,
-        actions: <Type, Action<Intent>>{
-          BackIntent: CallbackAction<BackIntent>(
-            onInvoke: (intent) async {
-              final navigator = await context.maybePop();
-              if (navigator) {
-                return true;
-              } else {
-                return false;
-              }
-            },
-          ),
-        },
-        child: child,
-      ),
     );
   }
+
+  bool _isEditableTextFocused() {
+    final focus = FocusManager.instance.primaryFocus;
+    if (focus == null) return false;
+    final ctx = focus.context;
+    if (ctx == null) return false;
+
+    if (ctx.widget is EditableText) return true;
+    return ctx.findAncestorWidgetOfExactType<EditableText>() != null;
+  }
 }
 
 class BackIntent extends Intent {