Return to last viewed filter after search

app/src/main/java/com/todoroo/astrid/activity/MainActivityViewModel.kt

@@ -39,6 +39,7 @@ import org.tasks.filters.CaldavFilter
 import org.tasks.filters.Filter
 import org.tasks.filters.FilterProvider
 import org.tasks.filters.NavigationDrawerSubheader
+import org.tasks.filters.SearchFilter
 import org.tasks.filters.getIcon
 import org.tasks.preferences.DefaultFilterProvider
 import org.tasks.preferences.TasksPreferences
@@ -114,12 +115,9 @@ class MainActivityViewModel @Inject constructor(
             )
         }
         updateFilters()
+        if (filter !is SearchFilter) {
             defaultFilterProvider.setLastViewedFilter(filter)
         }
-
-    fun closeDrawer() {
-        _drawerOpen.update { false }
-        _state.update { it.copy(menuQuery = "") }
     }
 
     fun setDrawerState(opened: Boolean) {
@@ -238,4 +236,8 @@ class MainActivityViewModel @Inject constructor(
     }
 
     suspend fun getAccount(id: Long) = caldavDao.getAccount(id)
+
+    fun openLastViewedFilter() = viewModelScope.launch {
+        setFilter(defaultFilterProvider.getLastViewedFilter())
+    }
 }

app/src/main/java/com/todoroo/astrid/activity/TaskListFragment.kt

@@ -285,7 +285,7 @@ class TaskListFragment : Fragment(), OnRefreshListener, Toolbar.OnMenuItemClickL
             override fun handleOnBackPressed() {
                 if ((mainViewModel.state.value.filter as? SearchFilter)?.query?.isNotBlank() == true) {
                     lifecycleScope.launch {
-                        mainViewModel.resetFilter()
+                        mainViewModel.openLastViewedFilter()
                     }
                     if (search.isActionViewExpanded) {
                         search.collapseActionView()

app/src/main/java/org/tasks/preferences/DefaultFilterProvider.kt

@@ -56,7 +56,7 @@ class DefaultFilterProvider @Inject constructor(
 
     fun setLastViewedFilter(filter: Filter) = setFilterPreference(filter, R.string.p_last_viewed_list)
 
-    private suspend fun getLastViewedFilter() = getFilterFromPreference(R.string.p_last_viewed_list)
+    suspend fun getLastViewedFilter() = getFilterFromPreference(R.string.p_last_viewed_list)
 
     suspend fun getDefaultOpenFilter() = getFilterFromPreference(R.string.p_default_open_filter)