[New-bugs-announce] [issue42831] IDLE fix colours for MacOS dark mode

[E. Paine]

New submission from E. Paine <paineelisha at gmail.com>:

Currently IDLE, in some places, uses predefined colours which assume it is in light mode. However, on the new Universal2 installers (I tested using 3.10.0a4) this causes issues, where this can no longer be assumed.

Taking the "About IDLE" dialogue as an example, it appears in a light theme and most notably makes button text very hard to read (as this is changed to white). I propose, on macOS systems running Tk >=8.6.10, we try to switch these colours to the system colours described in https://github.com/tcltk/tk/blob/main/macosx/README (IMO, we would test colour availability and catch a TclError rather than specifying conditions ourselves). For the about dialogue I think we would, for example, replace `#bbbbbb` with one of the `systemWindowBackgroundColor`s.

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assignee: terry.reedy
components: IDLE
messages: 384391
nosy: epaine, taleinat, terry.reedy
priority: normal
severity: normal
status: open
title: IDLE fix colours for MacOS dark mode
versions: Python 3.10, Python 3.8, Python 3.9

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue42831>
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