[fenix] For https://github.com/mozilla-mobile/fenix/issues/1586: Behavior when adding a duplicate bookmark (https://github.com/mozilla-mobile/fenix/pull/2195)

app/src/main/java/org/mozilla/fenix/browser/BrowserFragment.kt

@@ -370,9 +370,33 @@ class BrowserFragment : Fragment(), BackHandler, CoroutineScope,
                     }
                     is QuickActionAction.BookmarkPressed -> {
                         requireComponents.analytics.metrics.track(Event.QuickActionSheetBookmarkTapped)
+                        bookmarkTapped()
+                    }
+                    is QuickActionAction.ReadPressed -> {
+                        requireComponents.analytics.metrics.track(Event.QuickActionSheetReadTapped)
+                        ItsNotBrokenSnack(context!!).showSnackbar(issueNumber = "908")
+                    }
+                }
+            }
+        assignSitePermissionsRules()
+    }
+
+    private fun bookmarkTapped() {
         getSessionById()?.let { session ->
             CoroutineScope(IO).launch {
-                                val guid = requireComponents.core.bookmarksStorage
+                val components = requireComponents
+                val existing = components.core.bookmarksStorage.getBookmarksWithUrl(session.url)
+                val found = existing.isNotEmpty() && existing[0].url == session.url
+                if (found) {
+                    launch(Main) {
+                        Navigation.findNavController(requireActivity(), R.id.container)
+                            .navigate(
+                                BrowserFragmentDirections
+                                    .actionBrowserFragmentToBookmarkEditFragment(existing[0].guid)
+                            )
+                    }
+                } else {
+                    val guid = components.core.bookmarksStorage
                         .addItem(
                             BookmarkRoot.Mobile.id,
                             session.url,
@@ -407,13 +431,6 @@ class BrowserFragment : Fragment(), BackHandler, CoroutineScope,
                 }
             }
         }
-                    is QuickActionAction.ReadPressed -> {
-                        requireComponents.analytics.metrics.track(Event.QuickActionSheetReadTapped)
-                        ItsNotBrokenSnack(context!!).showSnackbar(issueNumber = "908")
-                    }
-                }
-            }
-        assignSitePermissionsRules()
     }
 
     override fun onStop() {