Bug 1277657 Fix a race condition in devtools test helper_inline_editor.js. r=jdescottes

devtools/client/shared/test/helper_inplace_editor.js

@@ -99,7 +99,7 @@ function* testCompletion([key, completion, index, total], editor) {
 
   yield onSuggest;
   yield onVisibilityChange;
-  yield waitForTick();
+  yield waitForTime(5);
 
   info("Checking the state");
   if (completion !== null) {