any line that was ever damaged was always damaged, and it worked pretty well.

when updating the screen.

This should fix the weird long-delayed update issue.

the screen.  This fixes the phantom cursor issue.

For regular vstatlock things, only hold the lock long enough to copy the
variables that will be used.

For vstat.vmem stuff, create a separate reference-counting vmem structure
and a new vmem_lock so the memcpy() of the vmem won't block basic vstat
accesses.

This appears to fix the recently-added "blockiness" of screen updates in
SyncTERM, without risking deadlocks or unlocked accesses... the major issue
holding up a release.

issues.

and release it last.

hold the lock.  This should finally fix all the things I hope.

a potential problem with grabbing vstatlock).  Call XCloseDisplay and terminate
the X11 event thread on exit().

This still does not prevent the crash on exit for Linux.  This appears to be
an issue with SDL.

for the four current fonts... -99 (uninitialized), and -1 (loaded font).

-99 was supposed to be automagically converted to CP437, but a bug in
revision 1.40 (Feb 27, 2015) made this not happen.  As a result, the font
was copied from an index of -99 in the font data array.  This was garbage
on some platforms and appears to have caused crashes in others.

the high intensity attribute can.  Using CTerm, this is controlled via the
CSI [ ? 34 h/l commands.

Also add CSI [ ? 35 h which disables blinking (reversed by CSI [ ? 35 l)

As with mouse.h, this shouldn't be a separate header.

I've likely broken something though, so if you see weird behaviour with
extended ASCII, let me know please.

Thanks for the bug report DigitalMan!

varied widely by platform.

0) Default font, selected whenever textmode() is called.
	Updating also updates current font (1) but currently does not update
	the secondary font (2).
1) Primary font
2) Secondary font

                 Enable         Disable
Alt Charset     CSI[?31h       CSI[?31l
Disable Bright  CSI[?32h       CSI[?32l
Bright BG       CSI[?33h       CSI[?33l

1) The ability to make attribute bit three select a second character set
2) The ability to make the blink attribute toggle background intensity
3) The ability to make attribute bit three NOT select high intensity
4) More control over the cursor than just three constants

CTerm support to follow using private set mode parameters.

I really can't think of any case where we can crash in here now.

.5 seconds of initialization.  This may fix the reported crashes on OS X
at startup using SDL mode.

More alloc reductions for cterm
Overhaul of ATASCII mode.  Works better with break animations now, but there
are still a couple glitches.

I think I need someone with real hardware and real terminal software to
answer a few questions (especially about edge effects)

(Which is used by the scroll functions)

Use movetext() rather than alloc()/gettext()/puttext() in cterm.c

undamaged lines have changed.