Re: "Final" version of tty child frames

[martin rudalics]

> Did you try this with auto-hscroll-mode, both set to t and to
> current-line?  What happens then if you move cursor with C-n and enter
> a line which is partially obscured by a child frame?  Or if point
> becomes hidden because it enters the obscure part of the frame from
> above or below, not from left or from right?

I now checked these and see no problems.  I see problems when moving
point in a child frame with truncated lines but this might be a separate
problem.

>> +  if (is_tty_selected && glyph->charpos > PT)
>> +    {
>> +      w->cursor.hpos = -1;
>> +      w->cursor.x = -1;
>> +    }
>
> Why do you need this test, and specifically the second part of the
> condition?

It handles the case where the cursor should be hidden because of an
overlapping child frame.  I may run the loop in step 1 until the end of
all glyphs when there is an overlapping child frame.  But if I re-enter
in the combined matrix the part belonging to the underlying frame, I may
be at some glyph far beyond the glyph that would have covered PT because
in the combined glyph matrix some glyph of the child frame is at that
position.  So I have to make the cursor invisible in that case to not
irritate the user (as I did in a first approximation mentioned earlier).

martin