Re: Q: child frames on ttys

["Gerd Möllmann" <gerd.moellmann@gmail.com>]

martin rudalics <rudalics@gmx.at> writes:

>> 4. Making a frame visible means making all children frames visible.
>
> With the obvious exception that a child frame whose visibility is off
> should not be considered.  IIUC most applications show child frames only
> for a short period of time and make them invisible as soon as the user
> reacts in some way or restarts typing.

Thanks, that's true.

>
>> 6. Update: Build frame matrices for all windows visible on a terminal.
>>     Copy visible parts of child fraem desired glyphs to root frame
>>     desired glyphs. Then write to the screen.
>>
>> 7. After writing to the screen, copy visble parts of root frame
>>     current glyphs to current glyphs of children.
>
> What does the current glyph matrix of the root frame contain now?  The
> overwritten parts or the original ones?  Or are the original parts
> stashed away so they can be easily reused when the child frame is made
> invisible?

The curren matrix of the root frame must always reflect what is on the
screen, so that we can decide what to output to the terminal to make the
terminal display what the desired matrix says. IOW, the parts of the
root frame's current matrix that were overwritten don't really
interest anymore.