[Bug mi/16404] New: -var-set-update-range ignored on update

["jeff at approximatrix dot com" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=16404

            Bug ID: 16404
           Summary: -var-set-update-range ignored on update
           Product: gdb
           Version: 7.6
            Status: NEW
          Severity: normal
          Priority: P2
         Component: mi
          Assignee: unassigned at sourceware dot org
          Reporter: jeff at approximatrix dot com

Unless I am mistaken, -var-set-update-range does not seem to have any affect on
children that are updated.  Consider the following program:

#include <stdio.h>

int main(int argc, char *argv[])
{
int i;
int arr[512];

    printf("Starting up\n");

    for(i=0;i<512;i++)
        arr[i] = 3;

    printf("Assigned %d\n", i);

    return 0;
}

When I run the program via gdb, I'm using the following sequence of commands
via mi2:

=====
(gdb)
start
... plenty of output ...
(gdb)
-var-create v1 * arr
^done,name="v1",numchild="512",value="[512]",type="int
[512]",thread-id="1",has_more="0"
(gdb)
-var-list-children v1 0 2
^done,numchild="2",children=[child={name="v1.0",exp="0",numchild="0",type="int",thread-id="1"},child={name="v1.1",exp="1",numchild="0",type="int",thread-id="1"}],has_more="1"
(gdb)
break main.c:13
... plenty of output ...
(gdb)
cont
... plenty of output, break reached after loop ...
(gdb)
-var-set-update-range v1 0 2
^done
(gdb)
-var-update v1
... every child of v1 is now listed (512 in fact) ...
====

Perhaps I'm missing a detail, but I expect only to see the first to entries of
`arr` to be output.  I realize the above mixes console and mi2 commmands, but
it shouldn't be an issue.

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