Patch for line draw characters problem & screen scrolling

Micha Nelissen
Wed May 21 17:22:00 GMT 2003

Igor Pechtchanski wrote:
> On Wed, 21 May 2003, Christopher Faylor wrote:
>> On Wed, May 21, 2003 at 05:32:33PM +0200, Micha Nelissen wrote:
>>> * (write_normal): end of buffer check enables
>>> cursor to be out of range; it better emulates *nix terminal
>>> behaviour; ie. it is now possible to write a single character at
>>> right bottom of console buffer without the console scrolling the
>>> buffer.

> This behavior is controlled, at least in an xterm, by the "Scroll to
> Bottom on Tty Output" resource.  In the Windows console, no such

We're getting all the scrolling confused. My explanation was not clear

Let me define terms as I see them:
- buffer: all data which the user is able to see with the use of the
- window: data which the use is able to see without the use of the

They are 2 types of scrolling:
1) using the scrollbar to change the current window position in the buffer
2) when you write at the last line of the buffer and the cursor 'wraps',
then we need a new line to write next output.

I am referring to the second type of scrolling. When a character is written
in the very right bottom 'cell', then windows *immediately* 'scrolls' (2) to
the next line. I don't want that. *nix behaviour (as I saw it) only scrolls
if *another* character is written. So temporarily the cursor is
'out-of-range' ie. outside the buffer. If another character is written
*without* moving the cursor, then *and only then* all output is moved up.

BTW: you will receive a new set of patches, replacing this one large patch,
later. I will hopefully clear up the other issues when I send those.

Hope this clears it up,


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