tabset uses wrong padding for windows in its tabs
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#45 tabset uses wrong padding for windows in its tabs
Hi!
There's a bug in BLT 3 tabset widget: it doubles left and top paddings when drawing windows inside tabs. The attached demo (taken from the Python's PMW library and rewritten in Tcl) shows this in the Helpers panel (there is a lone button with huge paddings, it should be centered in the tab, but it's shifted down and to the right). Appears that subtracting the paddings from the cavity width and height is missing in bltTabset.c (it is there in version 2). The attached patch re-adds the code.
