Deprecate Tk/Tcl 8.4, to be removed in Pillow 10 (2023-07-01)

[radarhere]

Tk/Tcl 8.4.0 was released Sep 18, 2000
Tk/Tcl 8.5.0 was released Dec 20, 2007
Tk/Tcl 8.4.20, the most recent version of 8.4, was released Jun 1, 2013

Support for Tk/Tcl < 8.4 was removed in #1288

[hugovk]

Sounds reasonable. Do they have formal EOL dates for Tk/Tcl?

Pillow 10 (2023-01-02) is some time away, I'm wondering what the status of 8.5 will be by then.

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https://www.tcl.tk/ says 8.7 is in alpha.

https://www.tcl.tk/software/tcltk/choose.html says 8.6 is latest stable (8.6.0 released Dec 20, 2012), and:

Tcl/Tk 8.6.10 is the currently recommended release.

For 8.4 and earlier:

Downloading Tcl/Tk 8.6.10 or newer is recommended

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https://www.freshports.org/x11-toolkits/tk85/ says:

DEPRECATED: Tcl/Tk 8.5 is nearing EOL, please consider porting to Tcl/Tk 8.6

And on 12 Jun 2019:

Deprecate Tcl/Tk 8.5 and dependent ports

Tcl/Tk 8.5 is approaching EOL. It might or might get another patch release with 8.7 is released, but people should have started migrating to 8.6 long ago.

Let's include 8.5 in the deprecation?

[radarhere]

The last release of Tcl/Tk 8.5 was 8.5.19 on February 12, 2016

While I haven't seen formal dates, https://core.tcl-lang.org/tcl/wiki?name=Index states

Tcl 8.5 is at End of Life -- please upgrade to 8.6.*!!!

amazon-2-amd64 is still using Tk 8.5 however - https://github.com/python-pillow/Pillow/runs/1804791690?check_suite_focus=true#step:6:543

[hugovk]

Okay, let's keep 8.5, doesn't actually affect code removals right now, unlike with 8.4.

We can add 8.5 at a later date if necessary, we have the whole of 2021 for it to join the Pillow 10 (2023-01-02 edit: 2023-07-01) train.

Thanks!