Callbacks can now go off when the text window scrolls (newline or line wrap).
In particular, they can go off when Scroll Lock etc have frozen the text output. Detail: The callback chain is examined at least once per line scroll. Additionally, it is examined repeatedly while Scroll Lock or Ctrl-Shift are acting, while idling between lines if Ctrl is held down, and while waiting for the Shift key to be pressed at the bottom of a screen when in page mode. The opportunity is also taken to call Portable_Idle after each time that the callback chain has been examined. Admin: Not tested. Version 5.27. Tagged as 'Kernel-5_27'
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