[Bug 210206] systat -vm: ignore feature does not work correctly

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=210206

            Bug ID: 210206
           Summary: systat -vm: ignore feature does not work correctly
           Product: Base System
           Version: 10.3-RELEASE
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: bin
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: la5lbtyi at aon.at

Scenario:
- 7 SATA disks ada{0..6}
- md0 on /tmp
- heavy disk activity on ada6;
  in another scenario, heavy disk activity on all disks
- running "systat -vm 1"
- typing ":ignore md0"

Result:
- Before typing ":ignore md0": systat displays drives md0 and ada0..ada5
- After typing ":ignore md0": systat once displays drives ada0..ada6 and then
displays only drive md0

Expected result:
- Before typing ":ignore md0": systat displays drives md0 and ada0..ada5
- After typing ":ignore md0": systat displays drives ada0..ada6

Notes:
- The "ignore" feature seems to be very fragile in many situations. The
scenario described is just one where it misbehaves and ultimately displays
completely different disks.
- The feature seems to be sensitive to dynamic changes in the disk
configuration. Adding or removing devices typically garbles the selection.

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