Fix Quick Copy drag with export format

chrome/content/zotero/xpcom/quickCopy.js

@@ -29,40 +29,43 @@ Zotero.QuickCopy = new function() {
 	var _initTimeoutID
 	var _initPromise;
 	var _initialized = false;
+	var _initCancelled = false;
 	var _siteSettings;
 	var _formattedNames;
 	
 	this.init = Zotero.Promise.coroutine(function* () {
+		Zotero.debug("Initializing Quick Copy");
+		
 		yield this.loadSiteSettings();
 		
+		if (!_initialized) {
+			// Make sure export translator code is loaded whenever the output format changes
+			Zotero.Prefs.registerObserver("export.quickCopy.setting", _loadOutputFormat);
+			_initialized = true;
+		}
+		
 		// Load code for selected export translator ahead of time
 		// (in the background, because it requires translator initialization)
-		_initTimeoutID = setTimeout(() => {
+		Zotero.Schema.schemaUpdatePromise
+		.then(function () {
+			if (_initCancelled) return;
+			
 			// Avoid random translator initialization during tests, which can result in timeouts,
 			// if an export format is selected
 			if (Zotero.test) return;
 			
-			_initTimeoutID = null;
+			_initPromise = _loadOutputFormat();
-			_initPromise = _loadOutputFormat().then(() => _initPromise = null);
+		});
-		}, 5000);
-		
-		if (!_initialized) {
-			Zotero.Prefs.registerObserver("export.quickCopy.setting", () => _loadOutputFormat());
-			_initialized = true;
-		}
 	});
 	
 	
 	this.uninit = function () {
-		// Cancel load if not yet done
+		_initCancelled = true;
-		if (_initTimeoutID) {
-			clearTimeout(_initTimeoutID);
-			_initTimeoutID = null
-		}
 		// Cancel load if in progress
 		if (_initPromise) {
 			_initPromise.cancel();
 		}
+		Zotero.Prefs.unregisterObserver("export.quickCopy.setting", _loadOutputFormat);
 	};
 	
 	
@@ -451,6 +454,7 @@ Zotero.QuickCopy = new function() {
 		var format = Zotero.Prefs.get("export.quickCopy.setting");
 		format = Zotero.QuickCopy.unserializeSetting(format);
 		if (format.mode == 'export') {
+			Zotero.debug("Preloading code for Quick Copy export format");
 			yield Zotero.Translators.init();
 			let translator = Zotero.Translators.get(format.id);
 			translator.cacheCode = true;

chrome/content/zotero/xpcom/translation/translators.js

@@ -41,16 +41,25 @@ Zotero.Translators = new function() {
 	 *     available (e.g., in updateBundledFiles()), to avoid unnecesary file reads
 	 */
 	this.init = Zotero.Promise.coroutine(function* (options = {}) {
-		if (_initializationDeferred && !options.reinit) {
-			return _initializationDeferred.promise;
-		}
-		
 		// Wait until bundled files have been updated, except when this is called by the schema update
 		// code itself
 		if (!options.fromSchemaUpdate) {
 			yield Zotero.Schema.schemaUpdatePromise;
 		}
 		
+		// If an initialization has already started, a regular init() call should return the promise
+		// for that (which may already be resolved). A reinit should yield on that but then continue
+		// with reinitialization.
+		if (_initializationDeferred) {
+			let promise = _initializationDeferred.promise;
+			if (options.reinit) {
+				yield promise;
+			}
+			else {
+				return promise;
+			}
+		}
+		
 		_initializationDeferred = Zotero.Promise.defer();
 		
 		Zotero.debug("Initializing translators");