Use "PDF" attachment title for all individual PDFs from Mendeley import

https://forums.zotero.org/discussion/comment/327390/#Comment_327390

chrome/content/zotero/import/mendeley/mendeleyImport.js

@@ -111,6 +111,11 @@ Zotero_Import_Mendeley.prototype.translate = async function (options = {}) {
 			let docURLs = urls.get(document.id);
 			let docFiles = files.get(document.id);
 			
+			// If there's a single PDF file, use "PDF" for the attachment title
+			if (docFiles && docFiles.length == 1 && docFiles[0].fileURL.endsWith('.pdf')) {
+				docFiles[0].title = 'PDF';
+			}
+			
 			// If there's a single PDF file and a single PDF URL and the file exists, make an
 			// imported_url attachment instead of separate file and linked_url attachments
 			if (docURLs && docFiles) {
@@ -124,7 +129,6 @@ Zotero_Import_Mendeley.prototype.translate = async function (options = {}) {
 						if (x.fileURL.endsWith('.pdf')) {
 							x.title = 'PDF';
 							x.url = pdfURLs[0];
-							x.contentType = 'application/pdf';
 						}
 					});
 					// Remove PDF URL from URLs array
@@ -988,7 +992,8 @@ Zotero_Import_Mendeley.prototype._saveFilesAndAnnotations = async function (file
 				let options = {
 					libraryID,
 					parentItemID,
-					file: realPath
+					file: realPath,
+					title: file.title
 				};
 				// If we're not set to link files or file is in Mendeley downloads folder, import it
 				if (!this._linkFiles || this._isDownloadedFile(path)) {

chrome/content/zotero/xpcom/attachments.js

@@ -42,6 +42,7 @@ Zotero.Attachments = new function(){
 	 * @param {nsIFile|String} [options.file] - File to add
 	 * @param {Integer} [options.libraryID]
 	 * @param {Integer[]|String[]} [options.parentItemID] - Parent item to add item to
+	 * @param {String} [options.title]
 	 * @param {Integer[]} [options.collections] - Collection keys or ids to add new item to
 	 * @param {String} [options.fileBaseName]
 	 * @param {String} [options.contentType]
@@ -57,6 +58,7 @@ Zotero.Attachments = new function(){
 		var path = file.path;
 		var leafName = file.leafName;
 		var parentItemID = options.parentItemID;
+		var title = options.title;
 		var collections = options.collections;
 		var fileBaseName = options.fileBaseName;
 		var contentType = options.contentType;
@@ -91,7 +93,7 @@ Zotero.Attachments = new function(){
 				else if (libraryID) {
 					attachmentItem.libraryID = libraryID;
 				}
-				attachmentItem.setField('title', newName);
+				attachmentItem.setField('title', title != undefined ? title : newName);
 				attachmentItem.parentID = parentItemID;
 				attachmentItem.attachmentLinkMode = this.LINK_MODE_IMPORTED_FILE;
 				if (collections) {
@@ -151,6 +153,7 @@ Zotero.Attachments = new function(){
 	/**
 	 * @param {nsIFile|String} options.file - File to add
 	 * @param {Integer[]|String[]} [options.parentItemID] - Parent item to add item to
+	 * @param {String} [options.title]
 	 * @param {Integer[]} [options.collections] - Collection keys or ids to add new item to
 	 * @param {String} [options.contentType] - Content type
 	 * @param {String} [options.charset] - Character set
@@ -162,6 +165,7 @@ Zotero.Attachments = new function(){
 		
 		var file = Zotero.File.pathToFile(options.file);
 		var parentItemID = options.parentItemID;
+		var title = options.title;
 		var collections = options.collections;
 		var contentType = options.contentType || (yield Zotero.MIME.getMIMETypeFromFile(file));
 		var charset = options.charset;
@@ -171,10 +175,9 @@ Zotero.Attachments = new function(){
 			throw new Error("parentItemID and collections cannot both be provided");
 		}
 		
-		var title = file.leafName;
 		var item = yield _addToDB({
 			file,
-			title,
+			title: title != undefined ? title : file.leafName,
 			linkMode: this.LINK_MODE_LINKED_FILE,
 			contentType,
 			charset,