ui: mitigate navigation desync bug

This thing reared it's ugly head again during 3.2.0 testing. I think
I've found a terrible but probably functional workaround for it. Start
using it.

app/src/main/java/org/oxycblt/auxio/MainFragment.kt

@@ -148,6 +148,14 @@ class MainFragment :
             }
         }
 
+        // Workaround for a bug where fast navigation ends up desynchronizing the current
+        // destination in the main navigation graph.
+        findNavController().apply {
+            findDestination(R.id.main_fragment)?.let {
+                currentBackStackEntry?.destination = it
+            }
+        }
+
         // --- VIEWMODEL SETUP ---
         collectImmediately(detailModel.editedPlaylist, detailBackCallback::invalidateEnabled)
         collectImmediately(homeModel.showOuter.flow, ::handleShowOuter)