fix(feedback): capture onFormClose at shake time instead of registration

Capture the current onFormClose callback just before showing the dialog
rather than caching it during register(). This ensures callbacks set by
the user after SDK init are preserved across shake-triggered dialogs.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: antonis

sentry-android-core/src/main/java/io/sentry/android/core/FeedbackShakeIntegration.java

@@ -28,7 +28,6 @@ public final class FeedbackShakeIntegration
   private volatile @Nullable Activity currentActivity;
   private volatile boolean isDialogShowing = false;
   private volatile @Nullable Activity dialogActivity;
-  private @Nullable Runnable originalOnFormClose;
 
   public FeedbackShakeIntegration(final @NotNull Application application) {
     this.application = Objects.requireNonNull(application, "Application is required");
@@ -43,7 +42,6 @@ public void register(final @NotNull IScopes scopes, final @NotNull SentryOptions
     }
 
     addIntegrationToSdkVersion("FeedbackShake");
-    originalOnFormClose = this.options.getFeedbackOptions().getOnFormClose();
     application.registerActivityLifecycleCallbacks(this);
     options.getLogger().log(SentryLevel.DEBUG, "FeedbackShakeIntegration installed.");
 
@@ -119,6 +117,8 @@ private void startShakeDetection(final @NotNull Activity activity) {
                   if (isDialogShowing) {
                     return;
                   }
+                  final Runnable previousOnFormClose =
+                      options.getFeedbackOptions().getOnFormClose();
                   try {
                     isDialogShowing = true;
                     dialogActivity = active;
@@ -128,16 +128,16 @@ private void startShakeDetection(final @NotNull Activity activity) {
                             () -> {
                               isDialogShowing = false;
                               dialogActivity = null;
-                              options.getFeedbackOptions().setOnFormClose(originalOnFormClose);
-                              if (originalOnFormClose != null) {
-                                originalOnFormClose.run();
+                              options.getFeedbackOptions().setOnFormClose(previousOnFormClose);
+                              if (previousOnFormClose != null) {
+                                previousOnFormClose.run();
                               }
                             });
                     options.getFeedbackOptions().getDialogHandler().showDialog(null, null);
                   } catch (Throwable e) {
                     isDialogShowing = false;
                     dialogActivity = null;
-                    options.getFeedbackOptions().setOnFormClose(originalOnFormClose);
+                    options.getFeedbackOptions().setOnFormClose(previousOnFormClose);
                     options
                         .getLogger()
                         .log(SentryLevel.ERROR, "Failed to show feedback dialog on shake.", e);