bug#31546: 27.0.50; macOS child frames with no mode-line mouse click problem

[martin rudalics]

> Ok, I have a guess. I can reproduce it by setting scroll-margin to
> something like 5 and clicking on the last line. The window scrolls so that
> the point is visible 5 lines above the bottom of the window. Even if the
> scroll-margin is 0, I can reproduce it by clicking on the last line if it
> is partially visible (as it may be with frame-resize-pixelwise set). I do
> not know what makes child-frames without modelines more susceptible to
> this, but it at least looks like it's doing the same thing--scrolling the
> window to where it thinks it needs to be scrolled in order for the point to
> be fully visible.

So does 'mouse-set-point' get executed?  If it does, then on which
frame?  Note that if I understand Aaron correctly, the "scroll"
happens on the parent frame and not on the child frame.

martin