"Rectangular Selection" is not currently supported in Alphatk.  This means
you can only select contiguous characters of text.  This limitation will be
removed in a future release.

One annoyance is that the Tk text widget has a buggy indentation
algorithm for lines which start with a mixture of tabs and spaces.
This will hopefully be fixed in the future.  Those familiar with Tk may
wish to examine the source code and fix the problem.  This problem only
arises with a tab-size other than 8 (for tabsize 8 Tk has a hard-coded,
correct indentation algorithm!).

Problems fixed by upgrading Tcl/Tk:
----------------------------------

As a result of using Alphatk, I've reported various bugs in Tcl/Tk (often
with patches or fixes).  These have been generally fixed in newer releases,
so I usually advise upgrading to the latest Tcl/Tk version you are willing
to use (even some of the development releases, on occasion).  Fortunately, 
the Tcl community often backports fixes to add to stable development 
versions for release.  So Tcl/Tk 8.3.3, for instance, contains most
fixes from the Tcl8.4a1/a2/a3 development branch.

Known bugs in older versions of Tcl/Tk, which directly impact Alphatk
include:

Various file dialog problems with files containing spaces or
Tcl-sensitive or platform-illegal characters.  These are fixed in Tk 8.3.3/8.4a2

Tk 8.3.x won't dim disabled menubar items.  This is fixed in Tk 8.3.2/8.4a2.

Tk 8.2.0 on Windows has a known balloon help bug, which is fixed in Tk 8.2.1.

There is a known infinite loop when highlighting matching {}[] etc,
caused by a bug in Tk's text widget when a line contains a multi-byte
character (such as a bullet).  This has been fixed in Tk 8.3.

The multiline searching capability is a little better with Tk 8.3 than with
earlier releases.

In Tk 8.1/8.2.x the 'dump' text widget subcommand is buggy when multi-byte
characters are in the widget.  This affects 'getColors' and hence
anything which tries to use it.  This is fixed in Tk 8.3.0

Tk 8.3.0 has some binding keysym problems (e.g. ctrl-backspace) on
Windows which are fixed in Tk 8.3.1.