[Bug gdb/18363] New: source line echoing on "next" mysteriously turned off

["jason.vas.dias at gmail dot com" <sourceware-bugzilla at sourceware dot org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=18363

            Bug ID: 18363
           Summary: source line echoing on "next" mysteriously turned off
           Product: gdb
           Version: 7.7
            Status: NEW
          Severity: normal
          Priority: P2
         Component: gdb
          Assignee: unassigned at sourceware dot org
          Reporter: jason.vas.dias at gmail dot com
  Target Milestone: ---

With fully up-to-date Ubuntu 14.04.2 LTS @2015-05-01 's GDB 
7.7.1-0ubuntu5~14.04.2 , this sequence of input somehow turned
off echoing of input source lines, and I cannot understand why:

At this point, gdb is still echoing source lines with the 'n' / 'next' command: 
    (gdb) n
    233         if( i == Q_MSG_DURATION )
    (gdb) p (p - &buf[0])
    $20 = 140
    (gdb) p *((char[140]*)buf)
    $21 = "INSERT INTO quantiles VALUES( 1, 2, 0, 3, 2, 18, 419.362526251996 ,
15 , 1 , 469.946678558381 , 1 , 0 , 678.247236170935 , 7.73105044050213 "

But now it isn't - what did I do to turn it off ? Now only the source line
numbers are echoed on 'next' ( there were no intervening input lines between 
the last one shown above and this 'next'):

    (gdb) n
    290
    (gdb) 
    301
    (gdb) 
    293
    (gdb) n
    300
    (gdb) 
    293
    (gdb) 
    299
    (gdb) 
    293

I can't find any setting documented that turns echoing of source lines on or
off on 'next' .

I had previously done :
  (gdb) set print elements 0
to print whole arrays ( I now know I should have used 'set print null-stop
on').
But I can't understand how these settings would have effected source line
echoing or how a few print commands could turn off source line echoing .

Is there a setting that turns source line echoing on 'next' on or off that
I might have inadvertently set ?

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