Some file sync errors weren't being caught and displayed

chrome/content/zotero/xpcom/storage/queue.js

@@ -413,7 +413,7 @@ Zotero.Sync.Storage.Queue.prototype.stop = function () {
 	this._stopping = true;
 	for each(var request in this._requests) {
 		if (!request.isFinished()) {
-			request.stop();
+			request.stop(true);
 		}
 	}
 	

chrome/content/zotero/xpcom/storage/request.js

@@ -48,6 +48,7 @@ Zotero.Sync.Storage.Request = function (name, callbacks) {
 	this._remaining = null;
 	this._maxSize = null;
 	this._finished = false;
+	this._forceFinish = false;
 	this._changesMade = false;
 	
 	for (var func in callbacks) {
@@ -308,7 +309,11 @@ Zotero.Sync.Storage.Request.prototype.onProgress = function (channel, progress,
 /**
  * Stop the request's underlying network request, if there is one
  */
-Zotero.Sync.Storage.Request.prototype.stop = function () {
+Zotero.Sync.Storage.Request.prototype.stop = function (force) {
+	if (force) {
+		this._forceFinish = true;
+	}
+	
 	if (this.channel) {
 		this._stopping = true;
 		
@@ -330,6 +335,15 @@ Zotero.Sync.Storage.Request.prototype.stop = function () {
  * Mark request as finished and notify queue that it's done
  */
 Zotero.Sync.Storage.Request.prototype._finish = function () {
+	// If an error occurred, we wait to finish the request, since doing
+	// so might end the queue before the error flag has been set on the queue.
+	// When the queue's error handler stops the queue, it stops the request
+	// with stop(true) to force the finish to occur, allowing the queue's
+	// promise to be rejected with the error.
+	if (!this._forceFinish && this._deferred.promise.isRejected()) {
+		return;
+	}
+	
 	Zotero.debug("Finishing " + this.queue.name + " request '" + this.name + "'");
 	this._finished = true;
 	var active = this._running;

chrome/content/zotero/xpcom/storage/webdav.js

@@ -271,6 +271,8 @@ Zotero.Sync.Storage.WebDAV = (function () {
 							request.onProgress(a, b, c);
 						},
 						onStop: function (httpRequest, status, response, data) {
+							data.request.setChannel(false);
+							
 							deferred.resolve(
 								Q.fcall(function () {
 									return onUploadComplete(httpRequest, status, response, data);
@@ -880,6 +882,8 @@ Zotero.Sync.Storage.WebDAV = (function () {
 							request.onProgress(a, b, c)
 						},
 						onStop: function (request, status, response, data) {
+							data.request.setChannel(false);
+							
 							if (status == 404) {
 								var msg = "Remote ZIP file not found for item " + item.key;
 								Zotero.debug(msg, 2);

chrome/content/zotero/xpcom/storage/zfs.js

@@ -463,6 +463,8 @@ Zotero.Sync.Storage.ZFS = (function () {
 					request.onProgress(a, b, c);
 				},
 				onStop: function (httpRequest, status, response, data) {
+					data.request.setChannel(false);
+					
 					deferred.resolve(
 						onUploadComplete(httpRequest, status, response, data)
 					);
@@ -803,6 +805,8 @@ Zotero.Sync.Storage.ZFS = (function () {
 							request.onProgress(a, b, c)
 						},
 						onStop: function (request, status, response, data) {
+							data.request.setChannel(false);
+							
 							if (status != 200) {
 								var msg = "Unexpected status code " + status
 									+ " for request " + data.request.name