[Tcl-bugs] [Tk] (erikleunissen) tkt (Open): Tests event-9.15 and event-9.20 are broken, and fail on macOS/aqua when fixed

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Ticket Change [fa3d5994df5de5b6219871fd0e63e26d03735ea3f2b300ff969f5843dd8faa7d]
  [Tests event-9.15 and event-9.20 are broken, and fail on macOS/aqua when fixed]
  By      erikleunissen
  For     Tk
  On      2025-10-12T16:02:50.032
  Details https://core.tcl-lang.org/tk/tinfo?name=fa3d5994df5de5b6219871fd0e63e26d03735ea3f2b300ff969f5843dd8faa7d
  Ticket  https://core.tcl-lang.org/tk/tktview/c494cc25c4afef0425273eee288a7e7b02d260e7

Changed Fields
  icomment: Analysis and conclusion of the experiments regarding tests event-9.15
            and event-9.20
            ----------------------------------------------------------------------
            --------------

            The experiment targetted the following two questions regarding an
            extraneous  <Enter> event on the root window, for tests event-9.15 and
            event-9.20:  A. Reproducibility of the issue, on Catalina, Sequoia and
            Tahoe  B. Origin/cause of the extraneous <Enter> event.

            Results  -------  The raw results are here:

            [https://github.com/tcltk/tk/actions?query=branch%3Abug-c494cc25c4]

            Please see as separate files the outputs for test file event.test
            under macOS Catalina, Sequoia, Tahoe and Linux/x11 (debug and
            optimized builds  distinguished) in the archive file
            c494cc25c4-experiment.zip.

            Analysis and conclusion  -----------------------

            A. Reproducibility of the issue, on Catalina, Sequoia and Tahoe  * The
            failures of tests event-9.15 and event-9.20 have been shown to be  100
            % reproducible for macOS Catalina and macOS Sequoia, using machines
            at Github and machines owned by me.  * The test failures haven't
            occurred a single time on macOS Tahoe (at Github  and with 20 runs on
            the systems used by Marc).

            This leads me to the most important conclusion for the present ticket:
            The issue is not to be attributed to Tk, but to the macOS windowing
            system.  The issue exhibits at macOS versions Sequoia and older, and
            appears to be  fixed on macOS Tahoe.

            B. Origin/cause of the extraneous <Enter> event  Given the conclusion
            at A., the quest for the origin is not a priority  anymore.
            Nevertheless, this ticket raised a hypothesis as an explanation  of
            the extraneous <Enter> event: an overloaded WindowServer process.

            Regarding that hypothesis, I'd like to point out the following:  * the
            extraneous event only occurs for tests event-9.15 and event-9.20,  and
            at ever the same position in a sequence of window events.  *
            overloading implies late event notifications. However,  - the
            extraneous <Enter> event is not just late:  - it occurs extra, or
            extremely ou
            ...((truncated))
  login:    erikleunissen

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