idlwave-shell-mark-breakpoints

idlwave-shell-mark-breakpoints is a variable defined in `idlw-shell.el'.
Its value is

t

Documentation:
Non-nil means, mark breakpoints in the source files.
Valid values are:
nil Do not mark breakpoints.
'face Highlight line with `idlwave-shell-breakpoint-face'.
'glyph Red dot at the beginning of line. If the display does not
support glyphs, will use 'face instead.
t Glyph when possible, otherwise face (same effect as 'glyph).

You can customize this variable.