need to implement text-glyph gap in AbstractButton

see JLabel for interface

N/A

Buttons should behave the same as labels. Indeed, the fix is to copy the
icon-gap code from Labels.
  xxxxx@xxxxx   1998-03-17




Introducing the new integer iconGap property meets a difficulty:
There is no way to say whether it is set by user or by LAF.
because this property has integer type. We can't use UIResource
mechanism which applies only to properties of object type.

The issue can be solved using an isIconGapSet() method which tells
whether the property was set by user code.

  xxxxx@xxxxx   2000-07-13

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Do it!

What's taking so long? This is almost TWO years old!!  "Buttons should
behave the same as labels" is exactly right.  In fact, I'm surprised the
code for both of these things hasn't been further merged.
However, there is a workaround, kludgy as it might be, by going directly to the
"Button.textIconGap" UIManager property: UIManager.put(
"Button.textIconGap", new Integer( someTextIconGapValue ) )

Oops - forgot to mention that changing the UIManager property affects ALL
buttons, so it's not a complete workaround.