ComboBox: dropdown too wide

[bill]

After the checkin for the "invalid icon" (the yellow triangle with the exclamation mark), the ComboBox drop down is too wide, because it's being sized to include the space for the icon.

[bill]

The ComboBox? template is a 3 column table (<input>, arrow icon, and exclamation mark) which makes it difficult to size the drop down. I could size it (ie, make it as least as wide as) the arrow icon and <input> node, although I feel a bit uneasy about that calculation, and also about each of those nodes having a border rather than a border being on a container for both of them.

[bill]

Will be fixed by #4512.

[bill]

(In [10663]) 1. Move validation icon to appear inside the box (for TextBox?, ValidationTextBox?, ComboBox?, and Spinner template based widgets).

2. Width setting applies to outer node: setting combobox to width=100px leaves 16px

for the arrow icon and 84px for the input node (unless the error icon is shown, in which case the input gets less space). Size property desupported.

This is still rough; it needs some more CSS cleanup and haven't even looked at soria yet... but the basics are there.

Fixes #4444, #4512, #4489 Refs #4475, #4513