Re: A few notes on porting Tcl/Tk 8.6 → 9

Am 10.06.2025 um 10:10 schrieb Mark Summerfield:

I have been porting a small GUI game ~1400LOC from Tcl/Tk 8.6 → 9.
 **Changes for 8.6 → 9**
 I used ~ for $HOME a few times in one function, so had to change that.
 When drawing canvas polygons I found I was getting a 1 pixel black outline
that is _not_ present in the 8.6 version. So it appears that the default for
outline has changed. I easily fixed this by adding `-outline ""` but didn't
spot this in the Tk 9 release notes.
 The biggest amount of work was with the namespace change. So I had to change
a lot of `board::...` to `::board::...` and similar. This was tedious but
not difficult.
 **Changes since I was changing things**
 I switched from sourcing Tcl files to using `.tm` modules; much nicer.
 I switched from PNG images to SVG; again, much nicer.
 **Scaling**
 For scaling I use this line:
 `if {[info exists env(TK_SCALING)]} {tk scaling $env(TK_SCALING)}`
 and have an environment variable `TK_SCALING` which I set to different
values on my desktop and laptop.
 However this doesn't work when I put a Tcl/Tk app in a taskbar launcher so
I'm going to add scaling as a config option too.
 See Tcl/Tk 8.6: https://github.com/mark-summerfield/gravitate-tcl
and Tcl/Tk 9: https://github.com/mark-summerfield/gravitate-tcl9
 PS My ISP has now stopped supporting newsgroup access.
And a few years ago Google stopped supporting them.
I really wish there was a general Tcl/Tk mailing list that could
be used.

Mark,
thanks for you effort.
The porting wiki pages are:
https://core.tcl-lang.org/tcl/wiki?name=Migrating+scripts+to+Tcl+9&p
https://core.tcl-lang.org/tk/wiki?name=Migrating+scripts+to+Tk+9&p
The -outline is not mentioned there. I suppose, this is a bug.
May you file a report?
If it is not a bug, it would be great to add it to the wiki page.
Thanks for all,
Harald