[FLEX-23953] ComboBox rapid open and close gets in state where the control will no longer open.

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Duplicate
• Affects Version/s: Adobe Flex SDK 4.1 (Release)
• Component/s: mx: ComboBox
• Environment: Affected OS(s): Windows; Affected OS(s): Windows 7; Browser: Internet Explorer 8.x; Language Found: English
• Assignee: Adobe JIRA
• Reporter: Adobe JIRA
• Created: 11/May/10 09:22
• Updated: 11/May/10 13:11
• Resolved: 11/May/10 13:09

Description

Steps to reproduce:
1. Create an mx:ComboBox on SDK 4.1 in MXML.
2. Set up the dataProvider and labelField, set the mouseOver event to open the comboBox (mouseOver="cb.open()"), set the mouseOut event to close it (mouseOut="cb.close()").
3. Rapidly move the mouse pointer over and off the comboBox again and again for about 30 seconds, or until the comboBox stops opening.

*There's also a test app attached. Run it on Flex SDK 4.1 and do step 3.

Actual Results:
The ComboBox stops opening, more specifically in the displayDropdown() method of ComboBox.as it will always return from displayDropdown() too early because show == _showingDropdown in the first conditional.

Expected Results:
The ComboBox should be able to be opened and closed rapidly in these conditions. This worked in Flex SDK 3.5 just fine. _showingDropdown should not get stuck in a weird state where it is true when there is no dropdown and you are trying to show it.

Workaround (if any):
Not sure.