[fenix] For https://github.com/mozilla-mobile/fenix/issues/9987: Set FLAG_SECURE to dialog when flag set in activity. (https://github.com/mozilla-mobile/fenix/pull/9998)

* For https://github.com/mozilla-mobile/fenix/issues/9987: Add extension to secures dialog if parent activity is secured

* For https://github.com/mozilla-mobile/fenix/issues/9987: Set FLAG_SECURE to dialog when flag set in activity

app/src/main/java/org/mozilla/fenix/ext/Dialog.kt

@@ -0,0 +1,24 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+package org.mozilla.fenix.ext
+
+import android.app.Activity
+import android.app.Dialog
+import android.view.WindowManager
+
+/**
+ * Checks if activity's window has a FLAG_SECURE set and sets it to dialog
+ */
+fun Dialog.secure(activity: Activity?) {
+    this.window.apply {
+        val flags = activity?.window?.attributes?.flags
+        if (flags != null && flags and WindowManager.LayoutParams.FLAG_SECURE != 0) {
+            this?.setFlags(
+                WindowManager.LayoutParams.FLAG_SECURE,
+                WindowManager.LayoutParams.FLAG_SECURE
+            )
+        }
+    }
+}

app/src/main/java/org/mozilla/fenix/settings/account/AccountSettingsFragment.kt

@@ -42,6 +42,7 @@ import org.mozilla.fenix.components.metrics.Event
 import org.mozilla.fenix.ext.components
 import org.mozilla.fenix.ext.getPreferenceKey
 import org.mozilla.fenix.ext.requireComponents
+import org.mozilla.fenix.ext.secure
 import org.mozilla.fenix.ext.settings
 import org.mozilla.fenix.ext.showToolbar
 
@@ -240,7 +241,7 @@ class AccountSettingsFragment : PreferenceFragmentCompat() {
                     startActivity(intent)
                 }
                 create()
-            }.show()
+            }.show().secure(activity)
             it.settings().incrementShowLoginsSecureWarningSyncCount()
         }
     }