debug: better promise order when starting session

src/vs/workbench/parts/debug/electron-browser/debugService.ts

@@ -507,10 +507,10 @@ export class DebugService extends ee.EventEmitter implements debug.IDebugService
 	}
 
 	public createSession(openViewlet = !this.partService.isSideBarHidden()): TPromise<any> {
-		this.textFileService.saveAll().done(null, errors.onUnexpectedError);
 		this.clearReplExpressions();
 
-		return this.pluginService.onReady().then(() => this.configurationManager.setConfiguration(this.configurationManager.getConfigurationName())).then(() => {
+		return this.textFileService.saveAll().then(() => this.pluginService.onReady()).then(() => this.configurationManager.setConfiguration(this.configurationManager.getConfigurationName())).then(() => {
+
 			const configuration = this.configurationManager.getConfiguration();
 			if (!configuration) {
 				return this.configurationManager.openConfigFile(false).then(openend => {