[FLEX-12916] RTE in DataGrid when resized so that less than one row is visible due to bug in measure()

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: Adobe Flex SDK 3.0 (Release)
• Component/s: mx: DataGrid
• Environment: Affected OS(s): All OS Platforms; Affected OS(s): All OS Platforms; Browser: Internet Explorer 7.x; Language Found: English
• Assignee: Adobe JIRA
• Reporter: Adobe JIRA
• Created: 31/Oct/07 00:58
• Updated: 07/Nov/07 16:07
• Resolved: 06/Nov/07 16:58

Description

Steps to reproduce:
1. Create a DataGrid with one locked Column, enough other columns to cause the HorizontalScrollbar to display, 2 or more rows of data displayed.
2. Launch application, resize browser making window smaller vertically.
3. When size of the DataGrid becomes small enough that less than one complete row is visible there is an RTE

Actual Results:RTE thrown by lockedColumnContent when it access listItems[0].length as listItems[0] is null due to the renderer having been destroyed.

Expected Results:No RTE

Workaround (if any):None.

Having looked through the code it seems to me that DataGrid's
measure function has a bug in its measuredMinHeight calculation. Both
on line 1361 of DataGrid and line 3215 of ListBase the height of the
scrollbar is deducted causing the minHeight to be too small by 16pixels.

The calculaton starts of as 46px in ListBase:
2*22(rowHeight)+18(border+scrollbar)-16(scrollbar)=46
Then in DataGrid:
46-16(scrollbar)=30
At 30 pixels there is not enough height to display the header and a row
and I think this then causes the lockedColumnContent to do some stuff
which ends up in a RTE.