Pull-down terminal bleeds over to second display

[David]

In Ubuntu Mate 18.04, when you have a second monitor and have the pull-down terminal (F12) enabled, the terminal window extends part way into the second display. This was also an issue on 17.10.

[David (ruralgeek)]

ubuntu-report
{
  "Version": "18.04",
  "OEM": {
    "Vendor": "Dell Inc.",
    "Product": "OptiPlex 7010"
  },
  "BIOS": {
    "Vendor": "Dell Inc.",
    "Version": "A19"
  },
  "CPU": [
    {
      "Vendor": "GenuineIntel",
      "Family": "6",
      "Model": "58",
      "Stepping": "9"
    }
  ],
  "Arch": "amd64",
  "GPU": [
    {
      "Vendor": "10de",
      "Model": "0df8"
    }
  ],
  "RAM": 32.9,
  "Partitions": [
    244.6,
    4748.8,
    0.5,
    2147.5,
    2147.5,
    2147.5
  ],
  "Screens": [
    {
      "Resolution": "1680x1050",
      "Frequency": "59.95"
    },
    {
      "Resolution": "1680x1050",
      "Frequency": "59.95"
    }
  ],
  "Autologin": false,
  "LivePatch": false,
  "Session": {
    "DE": "MATE",
    "Name": "mate",
    "Type": "x11"
  },
  "Timezone": "America/Boise"
}

[Launchpad Janitor (janitor)]

[Expired for Ubuntu MATE because there has been no activity for 60 days.]