#301 treeview: items overwrite adyacent columns and looks wrong

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The attached test case shows a treeview with a series of nested items with numbers from 0 to 19 as text and with two associated columns. There are two problems:

1. The tree items invade the space used by the columns, overwriting them.

2. The text of the tree items, from the point that they invade the neighboring column, are partially displayed, and the open/close button is not shown. This effect can be seen when there are no columns too.

This is also an example of bug #1816195 about not updating horizontal scrollbars. Said bug seems to imply that the issue is with "pure" treeviews (i.e. no extra columns) but this test-case shows that the problem is more general.

Windows XP ActiveTcl 8.4.19 Tile 0.8.3.
Linux Kubuntu 9.04 x86_64 Tcl/Tk 8.4.19 Tile 0.8.2

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