This topic came up on [comp.lang.tcl], initially in this thread [http://groups.google.com/group/comp.lang.tcl/browse_thread/thread/278afed700e692c3/79283a297fda080b?lnk=raot#79283a297fda080b].

Some of the responses posted include:

   * Read [Changes in Tcl/Tk 8.5]
   * Scripts that depend on the exact behaviour of cursor
motion in the [text] widget may have problems.
   * Scripts that depend on details of font handling may have problems.
   * you're SOL if you're on Mac Classic. :-)
   * it's not a good idea to write scripts that depend on formats of particular error messages.
   * If you use only tcl.h, tk.h and the exported functions from the stubs table you're quite safe.
   * If you go from 8.4 to 8.5 it should be easy, simply recompile.
   * If you go from 8.x x <4 to 8.5 you may need to fix some CONST stuff that changed in 8.4.  (see http://wiki.tcl.tk/3669)
   * If you go from 7.x to 8.5 you can expect some more work.
   * If you use tclInt.h or other non public interfaces all bets are off..., try to recompile and see where the compiler bitches.
   * my very first test failed, trying xtem from http://www.ctan.org/tex-archive/support/xtem_texmenu/xtem/?action=/te...
======
I get (when pressing the exit button)

bad variable name "geom(.xtemqd)": upvar won't create a scalar variable that
looks like an array element
     while executing
"global [set var]"
     (procedure "writeVarList2File" line 5)
:
(followed by more text that I won't quote)
:
======

   * Reply was: This statement used to be "useless": it would have created a variable that is completely unreachable from Tcl code. It is now an error.
   * if you were using the dict as an extension in 8.4, you may want to
remove the package require dict since it is now built into 8.5.
   * also, there have been a number of significant upgrades for dicts in Tcl 8.5
   * integer operations no longer wrap around at 2^31.
   * tcl_precision changed - where previously numbers might have displayed as 3.3, under 8.5 they may show as 3.30000000000003 for example.  I had to fix this by adding additional trace commands and shadow variables to reformat the numbers.
   * grid behavior changed when the widget is smaller than the container. Tcl 8.5 added the grid anchor command but the 8.5 default is nw while 8.4 behavior was center.
   * take a look at the entries in the "changes" files (included in the Tcl and Tk source code distributions) that are marked ** POTENTIAL INCOMPATIBILITY **.

----
!!!!!!
%| [Category Documentation] |%
!!!!!!