[slime-devel] Reincarnate "eval..."

[Gábor Melis]

Running cvs HEAD I now realize that I grew to rely on checking the
modeline of lisp buffers to see whether there are outstanding
requests. Often, I start evalutations that take minutes or hours to
finish and it's useful to have this at a glance without having to
worry about missing when the return value is printed or having to
check the running threads.

The attached patch does not reinstate "eval...", instead it
displays the number of outstanding requests like "CON:sbcl{3}" if it's
greater than zero.

Currently there is a loop through buffer-list, it that's a problem maybe 
there is a better way to arrange for the modeline to be updated using a 
global mode-line-format variable as a trigger to signal the change in 
connection-state that is to be recomputed in each slime buffer.

The patch does not solve the minor problems caused by the use of 
run-with-idle-timer, namely that the modeline may not be updated if the 
status of the connection changes in the background while emacs is idle.

Cheers, Gábor
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