[FLEX-17335] An addChild of a custom component doesn't show/corrupt the display if a '\n' is written on a Label inside a busy loop (enter_frame or timer)

• Type: Bug
• Status: Closed
• Priority: Minor
• Resolution: Won't Fix
• Affects Version/s: Adobe Flex SDK 3.2 (Release)
• Component/s: MXML Components
• Environment: Affected OS(s): Windows; Affected OS(s): ; Browser: Other (specify version); Language Found: English
• Assignee: Adobe JIRA
• Reporter: Adobe JIRA
• Created: 29/Jan/09 04:38
• Updated: 13/Sep/10 13:30
• Resolved: 13/Sep/10 11:42

Description

See code below to reproduce the bug

Steps to reproduce:
1. add a busy loop: enter_frame or timer with 1 ms resolution
2. inside the loop set the text property of a Label or TextArea to '\n'
3. outside the loop, for example in a click event, addChild of a custom component extending Canvas (or any other container) and including anything

Actual Results:
a click on the application area doesn't show anything. If resized (when running on flash player) the custom component appears, but the display is corrupted and inconsistent

Expected Results:
the custom component is added and showed

Workaround (if any):
use '\r' instead of '\n'

Comments:
This seems a race condition. If timer resolution is set to 2 ms, the bug appears less frequently. If set to 3 ms the bug disappears (all this on a recent notebook)
I've found this bug both on flash player 9 and 10, and on air 1.5
I suspect that this bug appears also using PopupManager.

1. begin code: sampleApp.mxml
   <?xml version="1.0" encoding="utf-8"?>
   <mx:Application
   xmlns:mx="http://www.adobe.com/2006/mxml"
   applicationComplete="f()"
   >
   <mx:Script>
   <![CDATA[
   private function f():void
   Unknown macro: {// var t}

   ]]
   >
   </mx:Script>
   <mx:Label id="test"/>
   </mx:Application>

2. end sampleApp.mxml

1. begin code: MyComponent.mxml
   <?xml version="1.0" encoding="utf-8"?>
   <mx:Canvas xmlns:mx="http://www.adobe.com/2006/mxml">
   <mx:Button/>
   </mx:Canvas>
2. end MyComponent.mxml