Always try to commit open transactions at shutdown

chrome/content/zotero/xpcom/db.js

@@ -37,6 +37,7 @@ Zotero.DB = new function(){
 	this.commitTransaction = commitTransaction;
 	this.rollbackTransaction = rollbackTransaction;
 	this.transactionInProgress = transactionInProgress;
+	this.commitAllTransactions = commitAllTransactions;
 	this.tableExists = tableExists;
 	this.getColumns = getColumns;
 	this.getColumnHash = getColumnHash;
@@ -345,6 +346,24 @@ Zotero.DB = new function(){
 	}
 	
 	
+	/**
+	 * Safety function used on shutdown to make sure we're not stuck in the
+	 * middle of a transaction
+	 */
+	function commitAllTransactions(){
+		if (transactionInProgress()){
+			var level = _transactionNestingLevel;
+			_transactionNestingLevel = 0;
+			try {
+				Zotero.DB.commitTransaction();
+			}
+			catch (e){}
+			return level ? level : true;
+		}
+		return false;
+	}
+	
+	
 	function tableExists(table){
 		return _getDBConnection().tableExists(table);
 	}

chrome/content/zotero/xpcom/zotero.js

@@ -137,6 +137,12 @@ var Zotero = new function(){
 			return false;
 		}
 		
+		var level = Zotero.DB.commitAllTransactions();
+		if (level){
+			level = level===true ? '0' : level;
+			Zotero.debug("A transaction was still open! (level " + level + ")", 2);
+		}
+		
 		_shutdown = true;
 		
 		Zotero.backupDatabase();