In fixed size mode, the menu field always uses all the available width.
In non-fixed size mode, the menu field will resize itself to be as small
as possible.
With layout, usually the difference isn't noticeable, since the layout
will already try to resize the control to the smallest possible size.
But there are a few cases where it makes a difference, when the layout
is over-constrained and the menu field can't be made as small as
possible. In that case, the menu field would be forced to fill its
allocated space, where we can instead make it a little smaller.
Change-Id: I911d497218a09aab3824865968558df5d4b3cf98
Reviewed-on: https://review.haiku-os.org/c/haiku/+/6076
Reviewed-by: waddlesplash <waddlesplash@gmail.com>
Reviewed-by: John Scipione <jscipione@gmail.com>
Reviewed-by: Adrien Destugues <pulkomandy@pulkomandy.tk>
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