In two places IDLE uses incorrect unit for screen dimension:

It uses "5px", but the only documented valid suffixes are "c", "i", "m" and "p". Tk ignores the rest in versions < 8.7, but in 8.7 and 9.0 this is an error. And this is for good, because "px" did not mean pixels, as was expected, but printer's points (1/72 inch).

If we want to keep the same look, we should change "px" to "p". But if it originally should be in pixels, we should remove the suffix. In all other places padding is specified in pixels, and this makes sense, so I believe the latter option is better.

Linked PRs

• gh-120104: IDLE: Fix padding in config and search dialogs #120107
• [3.13] gh-120104: IDLE: Fix padding in config and search dialogs (GH-120107) #122740
• [3.12] gh-120104: IDLE: Fix padding in config and search dialogs (GH-120107) #122741