debug: when more than 1 adapter is interested in a language let the user choose

fixes #19670

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

@@ -397,9 +397,9 @@ export class ConfigurationManager implements debug.IConfigurationManager {
 			const codeEditor = <ICommonCodeEditor>editor.getControl();
 			const model = codeEditor ? codeEditor.getModel() : undefined;
 			const language = model ? model.getLanguageIdentifier().language : undefined;
-			const adapter = this.adapters.filter(a => a.languages && a.languages.indexOf(language) >= 0).pop();
-			if (adapter) {
-				return TPromise.as(adapter);
+			const adapters = this.adapters.filter(a => a.languages && a.languages.indexOf(language) >= 0);
+			if (adapters.length === 1) {
+				return TPromise.as(adapters[0]);
 			}
 		}