[3.15] gh-66331: Set correct WM_CLASS on X11 for IDLE windows (GH-152733)#152794
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This was referenced Jul 1, 2026
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Set the WM_CLASS of IDLE's long-lived windows (window-list windows and
the stack viewers) to "Idle" instead of the default "Toplevel", so that
window managers group and label them correctly.
(cherry picked from commit 4e16b8d)
Co-authored-by: Serhiy Storchaka storchaka@gmail.com