Bug 72609

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User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.0.1) Gecko/20020809

Description of problem:
The GDB (gud) mode in earlier releases of GNU Emacs (say 20.7) would display a
`=>' overlay in the beginning of the line being executed in a C program.  The
current version does not.

At first, I thought it was being smart and taking advantage of the fact that, on
X, it might as well just position the cursor on the active line, and let the
cursor work as the marker.

However, even emacs -nw fails to display the `=>' marker.  Or, more accurately,
it *does* display it, but it's quickly overwritten by something else.  This
makes it almost impossible to run a remote debugging session, since X isn't
really usable over low latencies.

Version-Release number of selected component (if applicable):


How reproducible:
Always

Steps to Reproduce:
1.Create a program, say foo.c:
  main () {
  }
2.Compile it with debugging info:
  % gcc -g -o foo foo.c
3.Start emacs in text mode:
  % emacs -nw
4.Start the debugger:
  M-x gdb ENTER foo ENTER
5.Set a breakpoint and start the program
  (gdb) b main
  (gdb) run
6.Try to figure out which is the active line.


Actual Results:  You can't figure it out unless you look at the line number in
the context bar, and translate that info into one of the lines being displayed
(can be tricky in a large file)

Expected Results:  The `=>' overlay should not be overwritten.

Additional info: