Fix crash when searching for "from:me"

Tusker/Screens/Search/MastodonSearchController.swift

@@ -88,7 +88,7 @@ class MastodonSearchController: UISearchController {
         if searchText.isEmpty || "from:me".contains(searchText) {
             fromSuggestions.append("from:me")
         }
-        if searchText != "me",
+        if searchText != "me" && searchText != "from:me",
            let match = acctRegex.firstMatch(in: searchText, range: NSRange(location: 0, length: searchText.utf16.count)) {
             let matched = (searchText as NSString).substring(with: match.range)
             fromSuggestions.append("from:\(matched)")

Tusker/Screens/Search/SearchResultsViewController.swift

@@ -46,6 +46,7 @@ class SearchResultsViewController: UIViewController, CollectionViewController {
     private let searchSubject = PassthroughSubject<String?, Never>()
     private var searchCancellable: AnyCancellable?
     private var currentQuery: String?
+    private var currentSearchResults: SearchResults?
     
     init(mastodonController: MastodonController, scope: Scope = .all) {
         self.mastodonController = mastodonController
@@ -260,7 +261,14 @@ class SearchResultsViewController: UIViewController, CollectionViewController {
             switch response {
             case let .success(results, _):
                 guard self.currentQuery == query else { return }
+                self.mastodonController.persistentContainer.performBatchUpdates { (context, addAccounts, addStatuses) in
+                    addAccounts(results.accounts)
+                    addStatuses(results.statuses)
+                } completion: {
+                    DispatchQueue.main.async {
                         self.showSearchResults(results)
+                    }
+                }
             case let .failure(error):
                 DispatchQueue.main.async {
                     self.showSearchError(error)
@@ -269,16 +277,18 @@ class SearchResultsViewController: UIViewController, CollectionViewController {
         }
     }
     
+    @MainActor
     private func showSearchResults(_ results: SearchResults) {
+        self.currentSearchResults = results
+        
         var snapshot = dataSource.snapshot()
         snapshot.deleteSections([.loadingIndicator])
+        removeResults(from: &snapshot)
         
-        self.mastodonController.persistentContainer.performBatchUpdates({ (context, addAccounts, addStatuses) in
         let resultTypes = self.scope.resultTypes
         if !results.accounts.isEmpty && resultTypes.contains(.accounts) {
             snapshot.appendSections([.accounts])
             snapshot.appendItems(results.accounts.map { .account($0.id) }, toSection: .accounts)
-                addAccounts(results.accounts)
         }
         if !results.hashtags.isEmpty && resultTypes.contains(.hashtags) {
             snapshot.appendSections([.hashtags])
@@ -287,13 +297,9 @@ class SearchResultsViewController: UIViewController, CollectionViewController {
         if !results.statuses.isEmpty && resultTypes.contains(.statuses) {
             snapshot.appendSections([.statuses])
             snapshot.appendItems(results.statuses.map { .status($0.id, .unknown) }, toSection: .statuses)
-                addStatuses(results.statuses)
         }
-        }, completion: {
-            DispatchQueue.main.async {
-                self.dataSource.apply(snapshot)
-            }
-        })
+        
+        dataSource.apply(snapshot)
     }
     
     private func showSearchError(_ error: Client.Error) {
@@ -563,7 +569,9 @@ extension SearchResultsViewController: UISearchBarDelegate {
     func searchBar(_ searchBar: UISearchBar, selectedScopeButtonIndexDidChange selectedScope: Int) {
         let newQuery = searchBar.searchQueryWithOperators
         let newScope = Scope.allCases[selectedScope]
-        if self.scope == .all && currentQuery == newQuery {
+        if currentQuery == newQuery,
+           let currentSearchResults {
+            if self.scope == .all {
                 self.scope = newScope
                 var snapshot = dataSource.snapshot()
                 if snapshot.sectionIdentifiers.contains(.accounts) && scope != .people {
@@ -576,6 +584,10 @@ extension SearchResultsViewController: UISearchBarDelegate {
                     snapshot.deleteSections([.statuses])
                 }
                 dataSource.apply(snapshot)
+            } else {
+                self.scope = newScope
+                showSearchResults(currentSearchResults)
+            }
         } else {
             self.scope = newScope
             performSearch(query: newQuery)