Version 1.0.0 (#352)

* hide beta warning

* [Bugfix 1.0.0] Fixed an issue with drag to action not working for some actions

* - Fix issue (3) "Oversized thumbnails"
- Fix separator insets in item list

* - Produce an appropriate error when an upload fails due to insufficient space left on the server (fix (4))

* - Fixing issue (1) and (2) via SDK update

* Version Bump to 114

* - disable table cell selection
- fixed long status messages, while setting dynamically numbers of lines

* Version Bump to 115

* - Fixed (5) where the progress of a file that completed download in the background was shown incorrectly

* - Improve progress updates and representation in ClientItemCell

* - Fix: indicate activity during last phase of setting up a new bookmark and whenever editing a bookmark and saving it (previously UI seemed stuck for a couple of seconds)

* - Added NSError+MessageResolution that resolves the localized description for OCErrors so they are included when serialized, so they become visible in the Files app, too
- Fixing issue (8) in #237

* Implemented improvement (13)

* - Fix newly introduced potential crash bug in renameItem FP method
- Remove trash method and permission flag for items in FP, so "Delete Now" is the only option and Files app shows a warning
- Fixing (11) in #237

* - Rename uploadsBarButton to plusBarButton in ClientQueryViewController
- Add new action extension location .plusButton
- Add Action extensions support to provide UIAlertAction objects
- Add .plusButton location to CreateFolder action
- Extend the ClientQueryViewController plusBarButton to include action extensions in the alert that's being shown
- Implementing improvement (15) from #237

* Fixed (13): restore multiple selection after reloading file list

* - Move File Upload and Photo Upload from ClientQueryViewController to distinct Action Extensions
- Extend ActionProgressHandler to cater for both publishing and unpublishing progress objects
- Replace repeated code with a method to provide a ActionProgressHandler in ClientItemQueryViewController
- Make CreateFolderAction require a folder as parent item
- Make MoveAction present on the provided ViewController, not its navigationController
- Extend error handling in several places

* Fixed (21): folder picker not canceleable when navigating into folder and back

* - SortBar overhaul / cleanup
	- remove create folder button from left
	- left-align the sort option and rename it "Sort by" (from "Sorted by")
	- turn the sort option button from a ThemeButton to a UIButton and replace the unicode arrow with an elegant chevron
	- remove sortBar location for action extensions
	- clean up SortBar code
- NSObject+ThemeApplication
	- replace use of isKindOfClass and force-casts with if let constructs
	- add support for UIButton themeing
- fix "flashing" reording right after opening a connection by setting the OCQuery sort method before starting the query
- fix bug where an alert was shown for invalid credentials, but the Edit button did not work
	- fix ClientRootViewController.closeClient(), so it calls the completionHandler
	- adjust the editing method to the changed view and navigation controller structure
- minor code formatting and style fixes in several places

* Fixed (22): no ‘more’ button in directory picker and now swipe to delete

* Another small fix for (22)

* Fix for multi-selection regression (items automatically selected) when re-entering multi-selection

* - Fix UI main thread violation in BookmarkViewController
- Fix spelling of CreateFolderAction.identifier value
- Simplify implementation of DuplicateAction by refactoring it to use new SDK APIs, addressing issue (7) in #237
- Fix potential future crash in ClientDirectoryPickerViewController by avoiding force-casting
- Make OCItem.parentItem in OCItem+Extension more robust using new SDK API
- Adapt FileProviderExtension to use new, supported SDK APIs instead of the island implementation that was -findKnownExistingItemInParent:withName:
- Add (and comment out) code that lets FileProviderExtension.createDirectoryWithName return as soon as the placeholder item is available
- Add empty implementations for trashItemWithIdentifier/untrashItemWithIdentifier/setLastUsedDate/supportedServiceSourcesForItemIdentifier to comply with requirement of overriding all methods raised in the documentation

* Fix for (24) refresh animation glitch

* Fixed (26) crash when trying to downsample corrupt image file

* Version Bump to 116

* Fixed (27): not downloading files which are present offline

* Using OCCore.localCopy() to test if the file is already downloaded

* Another fix for (27)

Not dismissing DisplayViewController when OpenIn action is triggered.

* - Update SDK

* - Address issue (17) from #237 by bringing up a custom error message when a user likely attempted a cross-server move operation through the Files app

* fixed earl grey ui test failures, because UI or logic changed in release_1.0.0 fixes

* - Address issue (30) in #237 via SDK update

* fixed memory leak, which causes that the viewcontroller was not released (this was recognized, because audio or video keeps playing in the background)

* - Updating SDK, fixing issues described for the initial release issue (30) fix

* - Fix issue (19) in #237
- Fix issue (30) in #237 with fixes described in owncloud/ios-sdk#46 (comment)

* - Addressing (30) in #237

* Fixed (35) handling taps in the PDFThumbnailsView

* Some fixes regarding thumbnail size calculation

* - Update to latest SDK (to solve (30))

* Fixed (31) plus couple of PDF thumbnail view fixes

* Fixed (37) disable horizontal scrolling in the gallery if there is a single item

* - Update ios-sdk which now includes important fixes from the ios-sdk feature/sharing branch

* - Fix another formatting warning

* - Certificate Manager now shows the acceptance reason for user-accepted certificates
- Certificate View now shows the acceptance reason description for user-accepted certificates

* Few cosmetic changes

* Removed unused instance variable

* Fixed (38) tap to hide bars -> recalculate image size

* Fixed an issue with swipe in the image gallery causing navigation bar to reappear

* Fixed (39) Going back to root folder when selected “Browse” tab is tapped

* - Fixing two issues from #237:
	- (25) Double deletion in maintenance mode
        - (41) Files re-appear in the files list after batch-deleting them

* - Fix (42) in #237: considerable CPU use and slow-down in busy/frequently updated directories

* - Fixing (33) in #237 via SDK update: give users option to keep file or retry when upload fails

* - Fix issue (32) and (40) in #237 by presenting ClientRootViewController
	- only when the core has been returned by OCCoreManager, showing an activity indicator in the selected cell until then
	- modally, using a custom push transition to avoid UINavigationController hell
- Fix issue where ClientRootViewController would dismiss the lat ClientQueryViewController while also being dismissed, leading to an inconsistent animation when looking closely

* - Cleanup

* - Cleanup

* Version Bump to 117

* Fixed UI tests which broke due to changes made to fix (32) and (40)

* Fixed remaining UI tests

* - Fix issue where logging in and out of a bookmark in quick succession could lead to hangs opening the bookmark (likely is (32) in #237)

* - Fix failing UI tests

* - Make certificate detail view more resilient

* - Update SDK to add logging around OCCoreManager core requests/returns

* - SDK update:
        - Make OCCoreManager use an administrative queue for every bookmark, so that one connection closing down or opening up can't hold up another
- Takes advantage of OCCoreManager managing every bookmark independently
	- allowing to select another bookmark if the previous one takes longer to open
	- not show the UI for a bookmark if Settings, Help or Add/Edit Bookmark UI is triggered meanwhile
	- fix crash caused by force-unwrapping self.core in ClientRootViewController.coreReady()

* - Address "(44) Re-save file to the same folder will lead to an error" in #237

* - Avoid showing download progress indicator when viewing files that are already downloaded (issue (46) in #237)
- Fix bug in PDFViewerViewController where CoreGraphics would throw an error when using pdfView with zero size (before properly laying it out)

* - Clean up DisplayViewController and remove force-casts
- Fix (47) "the non-openable files prompt the download progress bar in the "details" view" in #237

* removed localization for "Feedback" button

* Feature/heic to jpeg (#363)

* Added HEIC to JPEG conversion

* Localized strings for photo upload settings

* Fixed indentation

* Fixed license header

* Version Bump to 118

* Made sure that photo metadata is exported

.swiftlint.yml

@@ -29,6 +29,7 @@ disabled_rules:
     - line_length
     - type_name
     - vertical_parameter_alignment
+    - function_body_length
 custom_rules:
   empty_line_after_guard_statement:
     included: ".*\\.swift"

ownCloud File Provider/FileProviderEnumerator.m

@@ -282,7 +282,7 @@ - (void)provideItemsForChangeObserverFromQuery:(OCQuery *)query
 	{
 		if (_changeObservers.count > 0)
 		{
-			OCLogDebug(@"##### PROVIDE ITEMS TO %d --CHANGE-- OBSERVER FOR %@: %@", _changeObservers.count, query.queryPath, query.queryResults);
+			OCLogDebug(@"##### PROVIDE ITEMS TO %lu --CHANGE-- OBSERVER FOR %@: %@", _changeObservers.count, query.queryPath, query.queryResults);
 
 			for (FileProviderEnumeratorObserver *observer in _changeObservers)
 			{

ownCloud File Provider/FileProviderExtension.m

@@ -23,6 +23,7 @@
 #import "FileProviderEnumerator.h"
 #import "OCItem+FileProviderItem.h"
 #import "FileProviderExtensionThumbnailRequest.h"
+#import "NSError+MessageResolution.h"
 
 @interface FileProviderExtension ()
 
@@ -138,7 +139,7 @@ - (NSFileProviderItem)itemForIdentifier:(NSFileProviderItemIdentifier)identifier
 
 	if (outError != NULL)
 	{
-		*outError = returnError;
+		*outError = [returnError resolvedError];
 	}
 
 	return item;
@@ -233,7 +234,7 @@ - (void)startProvidingItemAtURL:(NSURL *)provideAtURL completionHandler:(void (^
 
 				FPLogCmd(@"Completed with error=%@", error);
 
-				completionHandler(error);
+				completionHandler([error resolvedError]);
 			}];
 
 			return;
@@ -350,28 +351,6 @@ - (void)stopProvidingItemAtURL:(NSURL *)url
 	//	}
 }
 
-#pragma mark - Helpers
-- (OCItem *)findKnownExistingItemInParent:(OCItem *)parentItem withName:(NSString *)name
-{
-	OCPath parentPath;
-	__block OCItem *existingItem = nil;
-
-	if (((parentPath = parentItem.path) != nil) && (name != nil))
-	{
-		OCPath destinationPath = [parentPath stringByAppendingPathComponent:name];
-
-		OCSyncExec(retrieveExistingItem, {
-			[self.core.vault.database retrieveCacheItemsAtPath:destinationPath itemOnly:YES completionHandler:^(OCDatabase *db, NSError *error, OCSyncAnchor syncAnchor, NSArray<OCItem *> *items) {
-				existingItem = items.firstObject;
-				OCSyncExecDone(retrieveExistingItem);
-			}];
-		});
-	}
-
-	return (existingItem);
-}
-
-
 #pragma mark - Actions
 
 // ### Apple template comments: ###
@@ -397,35 +376,41 @@ - (void)createDirectoryWithName:(NSString *)directoryName inParentItemIdentifier
 
 		FPLogCmd(@"Creating folder %@ inside %@", directoryName, parentItem.path);
 
-		if ((existingItem = [self findKnownExistingItemInParent:parentItem withName:directoryName]) != nil)
+		if ((existingItem = [self.core cachedItemInParent:parentItem withName:directoryName isDirectory:YES error:NULL]) != nil)
 		{
 			FPLogCmd(@"Completed with collission with existingItem=%@ (locally detected)", existingItem);
-//			completionHandler(nil, [NSError fileProviderErrorForCollisionWithItem:existingItem]); // This is what we should do according to docs
-			completionHandler(nil, OCError(OCErrorItemAlreadyExists)); // This is what we need to do to avoid users running into issues using the broken Files "Duplicate" action
+			// completionHandler(nil, [NSError fileProviderErrorForCollisionWithItem:existingItem]); // This is what we should do according to docs
+			completionHandler(nil, [OCError(OCErrorItemAlreadyExists) resolvedError]); // This is what we need to do to avoid users running into issues using the broken Files "Duplicate" action
 			return;
 		}
 
-		[self.core createFolder:directoryName inside:parentItem options:nil resultHandler:^(NSError *error, OCCore *core, OCItem *item, id parameter) {
+		[self.core createFolder:directoryName inside:parentItem options:@{
+//			OCCoreOptionPlaceholderCompletionHandler : [^(NSError * _Nullable error, OCItem * _Nullable item) {
+//				FPLogCmd(@"Completed placeholder creation with item=%@, error=%@", item, error);
+//
+//				completionHandler(item, [error resolvedError]);
+//			} copy]
+		} resultHandler:^(NSError *error, OCCore *core, OCItem *item, id parameter) {
 			if (error != nil)
 			{
 				if (error.HTTPStatus.code == OCHTTPStatusCodeMETHOD_NOT_ALLOWED)
 				{
 					// Folder already exists on the server
 					OCItem *existingItem;
 
-					if ((existingItem = [self findKnownExistingItemInParent:parentItem withName:directoryName]) != nil)
+					if ((existingItem = [self.core cachedItemInParent:parentItem withName:directoryName isDirectory:YES error:NULL]) != nil)
 					{
 						FPLogCmd(@"Completed with collission with existingItem=%@ (server response)", existingItem);
-			//			completionHandler(nil, [NSError fileProviderErrorForCollisionWithItem:existingItem]); // This is what we should do according to docs
-						completionHandler(nil, OCError(OCErrorItemAlreadyExists)); // This is what we need to do to avoid users running into issues using the broken Files "Duplicate" action
+						// completionHandler(nil, [NSError fileProviderErrorForCollisionWithItem:existingItem]); // This is what we should do according to docs
+						completionHandler(nil, [OCError(OCErrorItemAlreadyExists) resolvedError]); // This is what we need to do to avoid users running into issues using the broken Files "Duplicate" action
 						return;
 					}
 				}
 			}
 
 			FPLogCmd(@"Completed with item=%@, error=%@", item, error);
 
-			completionHandler(item, error);
+			completionHandler(item, [error resolvedError]);
 		}];
 	}
 	else
@@ -436,7 +421,7 @@ - (void)createDirectoryWithName:(NSString *)directoryName inParentItemIdentifier
 	}
 }
 
-- (void)reparentItemWithIdentifier:(NSFileProviderItemIdentifier)itemIdentifier toParentItemWithIdentifier:(NSFileProviderItemIdentifier)parentItemIdentifier newName:(NSString *)newName completionHandler:(void (^)(NSFileProviderItem _Nullable, NSError * _Nullable))completionHandler
+- (void)reparentItemWithIdentifier:(NSFileProviderItemIdentifier)itemIdentifier toParentItemWithIdentifier:(NSFileProviderItemIdentifier)parentItemIdentifier newName:(NSString *)newName completionHandler:(void (^)(NSFileProviderItem _Nullable reparentedItem, NSError * _Nullable))completionHandler
 {
 	NSError *error = nil;
 	OCItem *item=nil, *parentItem=nil;
@@ -451,54 +436,41 @@ - (void)reparentItemWithIdentifier:(NSFileProviderItemIdentifier)itemIdentifier
 		[self.core moveItem:item to:parentItem withName:((newName != nil) ? newName : item.name) options:nil resultHandler:^(NSError *error, OCCore *core, OCItem *item, id parameter) {
 			FPLogCmd(@"Completed with item=%@, error=%@", item, error);
 
-			completionHandler(item, error);
+			completionHandler(item, [error resolvedError]);
 		}];
 	}
 	else
 	{
-		FPLogCmd(@"Completed with item=%@ or parentItem=%@ not found, error=%@", item, parentItem, error);
-		completionHandler(nil, error);
-	}
-}
-
-- (void)renameItemWithIdentifier:(NSFileProviderItemIdentifier)itemIdentifier toName:(NSString *)itemName completionHandler:(void (^)(NSFileProviderItem renamedItem, NSError *error))completionHandler
-{
-	NSError *error = nil;
-	OCItem *item, *parentItem;
-
-	FPLogCmdBegin(@"Rename", @"Start of renameItemWithIdentifier=%@, toName=%@", itemIdentifier, itemName);
-
-	if (((item = (OCItem *)[self itemForIdentifier:itemIdentifier error:&error]) != nil) &&
-	    ((parentItem = (OCItem *)[self itemForIdentifier:item.parentLocalID error:&error]) != nil))
-	{
-		FPLogCmd(@"Renaming %@ in %@ to %@", item, parentItem, itemName);
+		if (([error.domain isEqual:NSFileProviderErrorDomain] && error.code == NSFileProviderErrorNoSuchItem) && (parentItem == nil) && (item != nil))
+		{
+			// When moving files from one OC bookmark to another, the Files app will call with the ID of the item to move on this server
+			// and the ID on the destination server for the item to move to. For now, we provide an error message covering that case. A
+			// future release could possibly go through the bookmarks, request the cores, search for the item IDs, etc. - and then implement
+			// a cross-server move using OCCore actions. The complexity of such an undertaking should not be underestimated, though, as in
+			// the case of moving folders, we'd have to download and upload entire hierarchies of files - that could change while we're at it.
+			FPLogCmd(@"parentItem not found. Likely a cross-domain move. Changing error message accordingly.");
+			error = OCErrorWithDescription(OCErrorItemNotFound, OCLocalized(@"The destination folder couldn't be found on this server. Moving items across servers is currently not supported."));
+		}
 
-		[self.core moveItem:item to:parentItem withName:itemName options:nil resultHandler:^(NSError *error, OCCore *core, OCItem *item, id parameter) {
-			FPLogCmd(@"Completed with item=%@, error=%@", item, error);
-			completionHandler(item, error);
-		}];
-	}
-	else
-	{
 		FPLogCmd(@"Completed with item=%@ or parentItem=%@ not found, error=%@", item, parentItem, error);
 		completionHandler(nil, error);
 	}
 }
 
-- (void)trashItemWithIdentifier:(NSFileProviderItemIdentifier)itemIdentifier completionHandler:(void (^)(NSFileProviderItem _Nullable, NSError * _Nullable))completionHandler
+- (void)renameItemWithIdentifier:(NSFileProviderItemIdentifier)itemIdentifier toName:(NSString *)itemName completionHandler:(void (^)(NSFileProviderItem renamedItem, NSError *error))completionHandler
 {
 	NSError *error = nil;
 	OCItem *item;
 
-	FPLogCmdBegin(@"Trash", @"Start of trashItemWithIdentifier=%@", itemIdentifier);
+	FPLogCmdBegin(@"Rename", @"Start of renameItemWithIdentifier=%@, toName=%@", itemIdentifier, itemName);
 
 	if ((item = (OCItem *)[self itemForIdentifier:itemIdentifier error:&error]) != nil)
 	{
-		FPLogCmd(@"Trashing %@", item);
+		FPLogCmd(@"Renaming %@ in %@ to %@", item, item.path.parentPath, itemName);
 
-		[self.core deleteItem:item requireMatch:YES resultHandler:^(NSError *error, OCCore *core, OCItem *item, id parameter) {
-			FPLogCmd(@"Completed with error=%@", error);
-			completionHandler(nil, error);
+		[self.core renameItem:item to:itemName options:nil resultHandler:^(NSError *error, OCCore *core, OCItem *item, id parameter) {
+			FPLogCmd(@"Completed with item=%@, error=%@", item, error);
+			completionHandler(item, [error resolvedError]);
 		}];
 	}
 	else
@@ -521,7 +493,7 @@ - (void)deleteItemWithIdentifier:(NSFileProviderItemIdentifier)itemIdentifier co
 
 		[self.core deleteItem:item requireMatch:YES resultHandler:^(NSError *error, OCCore *core, OCItem *item, id parameter) {
 			FPLogCmd(@"Completed with error=%@", error);
-			completionHandler(error);
+			completionHandler([error resolvedError]);
 		}];
 	}
 	else
@@ -659,7 +631,7 @@ - (void)importDocumentAtURL:(NSURL *)fileURL toParentItemIdentifier:(NSFileProvi
 		OCItem *existingItem;
 		OCCoreImportTransformation transformation = nil;
 
-		if ((existingItem = [self findKnownExistingItemInParent:parentItem withName:importFileName]) != nil)
+		if ((existingItem = [self.core cachedItemInParent:parentItem withName:importFileName isDirectory:NO error:NULL]) != nil)
 		{
 			// Return collission error
 			FPLogCmd(@"Completed with collission with existingItem=%@ (local)", existingItem);
@@ -715,7 +687,7 @@ - (void)importDocumentAtURL:(NSURL *)fileURL toParentItemIdentifier:(NSFileProvi
 				else
 				{
 					// Import of directories not supported
-					completionHandler(nil, OCError(OCErrorFeatureNotSupportedForItem));
+					completionHandler(nil, [OCError(OCErrorFeatureNotSupportedForItem) resolvedError]);
 					return;
 				}
 			}
@@ -727,7 +699,7 @@ - (void)importDocumentAtURL:(NSURL *)fileURL toParentItemIdentifier:(NSFileProvi
 			[transformation copy], OCCoreOptionImportTransformation,
 		nil] placeholderCompletionHandler:^(NSError *error, OCItem *item) {
 			FPLogCmd(@"Completed with placeholderItem=%@, error=%@", item, error);
-			completionHandler(item, error);
+			completionHandler(item, [error resolvedError]);
 		} resultHandler:^(NSError *error, OCCore *core, OCItem *item, id parameter) {
 			if ([error.domain isEqual:OCHTTPStatusErrorDomain] && (error.code == OCHTTPStatusCodePRECONDITION_FAILED))
 			{
@@ -777,7 +749,7 @@ - (void)setFavoriteRank:(NSNumber *)favoriteRank forItemIdentifier:(NSFileProvid
 
 		[self.core updateItem:item properties:@[ OCItemPropertyNameLocalAttributes ] options:nil resultHandler:^(NSError *error, OCCore *core, OCItem *item, id parameter) {
 			FPLogCmd(@"Completed with item=%@, error=%@", item, error);
-			completionHandler(item, error);
+			completionHandler(item, [error resolvedError]);
 		}];
 	}
 	else
@@ -812,7 +784,7 @@ - (void)setTagData:(NSData *)tagData forItemIdentifier:(NSFileProviderItemIdenti
 
 		[self.core updateItem:item properties:@[ OCItemPropertyNameLocalAttributes ] options:nil resultHandler:^(NSError *error, OCCore *core, OCItem *item, id parameter) {
 			FPLogCmd(@"Completed with item=%@, error=%@", item, error);
-			completionHandler(item, error);
+			completionHandler(item, [error resolvedError]);
 		}];
 	}
 	else
@@ -822,6 +794,65 @@ - (void)setTagData:(NSData *)tagData forItemIdentifier:(NSFileProviderItemIdenti
 	}
 }
 
+#pragma mark - Incomplete/Compatibility actions
+- (void)trashItemWithIdentifier:(NSFileProviderItemIdentifier)itemIdentifier completionHandler:(void (^)(NSFileProviderItem _Nullable, NSError * _Nullable))completionHandler
+{
+	NSError *error = nil;
+	OCItem *item;
+
+	/*
+		This File Provider does not actually support trashing items - and also indicates so via NSFileProviderItem.capabilities.
+
+		Regardless, iOS will call -trashItemWithIdentifier: instead of -deleteItemWithIdentifier: when a user chooses to replace an
+		existing file. And - if we return NSFeatureUnsupportedError - will make the replace action unusuable.
+
+		This File Provider therefore implements this method to work around this problem. As soon as iOS uses NSFileProviderItem.capabilities
+		and picks the correct action in that case, this implementation can and should be removed.
+	*/
+
+	FPLogCmdBegin(@"Trash", @"Start of trashItemWithIdentifier=%@", itemIdentifier);
+
+	if ((item = (OCItem *)[self itemForIdentifier:itemIdentifier error:&error]) != nil)
+	{
+		FPLogCmd(@"Deleting %@", item);
+
+		[self.core deleteItem:item requireMatch:YES resultHandler:^(NSError *error, OCCore *core, OCItem *item, id parameter) {
+			FPLogCmd(@"Completed with error=%@", error);
+			completionHandler(nil, [error resolvedError]);
+		}];
+	}
+	else
+	{
+		FPLogCmd(@"Completed with item=%@ not found, error=%@", item, error);
+		completionHandler(nil, error);
+	}
+}
+
+#pragma mark - Unimplemented actions
+/*
+	"You must override all of the extension's methods (except the deprecated methods), even if your implementation is only an empty method."
+	- [Source: https://developer.apple.com/documentation/fileprovider/nsfileproviderextension?language=objc]
+*/
+
+- (void)untrashItemWithIdentifier:(NSFileProviderItemIdentifier)itemIdentifier toParentItemIdentifier:(NSFileProviderItemIdentifier)parentItemIdentifier completionHandler:(void (^)(NSFileProviderItem _Nullable, NSError * _Nullable))completionHandler
+{
+	FPLogCmdBegin(@"Untrash", @"Invocation of unimplemented untrashItemWithIdentifier=%@ toParentItemIdentifier=%@", itemIdentifier, parentItemIdentifier);
+
+	completionHandler(nil, [NSError errorWithDomain:NSCocoaErrorDomain code:NSFeatureUnsupportedError userInfo:@{}]);
+}
+
+- (void)setLastUsedDate:(NSDate *)lastUsedDate forItemIdentifier:(NSFileProviderItemIdentifier)itemIdentifier completionHandler:(void (^)(NSFileProviderItem _Nullable, NSError * _Nullable))completionHandler
+{
+	FPLogCmdBegin(@"SetLastUsedDate", @"Invocation of unimplemented setLastUsedDate=%@ forItemIdentifier=%@", lastUsedDate, itemIdentifier);
+
+	completionHandler(nil, [NSError errorWithDomain:NSCocoaErrorDomain code:NSFeatureUnsupportedError userInfo:@{}]);
+}
+
+- (NSArray<id<NSFileProviderServiceSource>> *)supportedServiceSourcesForItemIdentifier:(NSFileProviderItemIdentifier)itemIdentifier error:(NSError * _Nullable __autoreleasing *)error
+{
+	return (nil);
+}
+
 #pragma mark - Enumeration
 - (nullable id<NSFileProviderEnumerator>)enumeratorForContainerItemIdentifier:(NSFileProviderItemIdentifier)containerItemIdentifier error:(NSError **)error
 {
@@ -981,4 +1012,3 @@ - (void)core:(OCCore *)core handleError:(NSError *)error issue:(OCIssue *)issue
 }
 
 @end
-

ownCloud File Provider/FileProviderExtensionThumbnailRequest.m

@@ -17,6 +17,7 @@
  */
 
 #import "FileProviderExtensionThumbnailRequest.h"
+#import "NSError+MessageResolution.h"
 
 @implementation FileProviderExtensionThumbnailRequest
 
@@ -68,7 +69,7 @@ - (void)requestNextThumbnail
 					if (!isOngoing)
 					{
 						dispatch_async(dispatch_get_global_queue(QOS_CLASS_DEFAULT, 0), ^{
-							self.perThumbnailCompletionHandler(itemIdentifier, thumbnail.data, (thumbnail==nil) ? nil : error);
+							self.perThumbnailCompletionHandler(itemIdentifier, thumbnail.data, (thumbnail==nil) ? nil : [error resolvedError]);
 
 							[self requestNextThumbnail];
 						});

ownCloud File Provider/Info.plist

@@ -19,7 +19,7 @@
 	<key>CFBundleShortVersionString</key>
 	<string>1.0</string>
 	<key>CFBundleVersion</key>
-	<string>113</string>
+	<string>118</string>
 	<key>OCAppGroupIdentifier</key>
 	<string>group.com.owncloud.ios-app</string>
 	<key>OCAppIdentifierPrefix</key>

ownCloud File Provider/NSError+MessageResolution.h

@@ -0,0 +1,29 @@
+//
+//  NSError+MessageResolution.h
+//  ownCloud File Provider
+//
+//  Created by Felix Schwarz on 09.04.19.
+//  Copyright © 2019 ownCloud GmbH. All rights reserved.
+//
+
+/*
+ * Copyright (C) 2019, ownCloud GmbH.
+ *
+ * This code is covered by the GNU Public License Version 3.
+ *
+ * For distribution utilizing Apple mechanisms please see https://owncloud.org/contribute/iOS-license-exception/
+ * You should have received a copy of this license along with this program. If not, see <http://www.gnu.org/licenses/gpl-3.0.en.html>.
+ *
+ */
+
+#import <Foundation/Foundation.h>
+
+NS_ASSUME_NONNULL_BEGIN
+
+@interface NSError (MessageResolution)
+
+- (NSError *)resolvedError;
+
+@end
+
+NS_ASSUME_NONNULL_END