I'm also investigating this issue.
I can reproduce it.
I have commented out the minWidth and width in the classic appearance, and
still have the same problem.
Hugh Gibson wrote:
>
>> The other problem is with the width of the ComboBoxEx widget.
>
> I also have a problem with this, with a ComboBoxEx within a grid. It's at
> the right-hand side of the grid, and the buttons outside of the grid mean
> that scrollbars are added to the grid by the browser. Not what I want in a
> dialog box!
>
> If I set the grid column to a width of 200 pixels, the drop-down button
> remains at the same point but the edit box extends underneath it for the
> whole width:
>
> +---------+---+------------+
> | | v | |
> +---------+---+------------+
>
> This is probably related to the Classic appearance having:
>
> "combo-box-ex-text-field" : {
> <snip>
> initial : function(vTheme) {
> return qx.lang.Object.mergeWith(vTheme.initialFrom("text-field"), {
> border : qx.renderer.border.BorderPresets.getInstance().none,
> minWidth : 30,
> width : 100,
>
> It makes it very difficult to use the combo box in a dialog, if you are
> trying to automatically layout the dialog rather than setting absolute
> positions.
>
>> Also, how can I change the width of the drop-down list?
>
> I would also like to know this.
>
> Also, the key sequence alt + down arrow will open the drop-down list as
> normal (in Windows) but it also results in the next item being selected in
> the list.
>
> Hugh
>
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