VTE's behavior definitely didn't change here since you reported the bug.
If the issue disappeared, it could've been a change in dosbox or
ncurses, or some other magic. Dunno.

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https://bugs.launchpad.net/bugs/1678271

Title:
  Background color erase (bce) is broken

Status in gnome-terminal package in Ubuntu:
  New

Bug description:
  I'm running my ncursesw application, displaying a black background.
  When the screen or a region scrolls up by one line, empty areas of the
  screen in the newly visible line show the default white background of
  gnome-terminal.

  If I remove the bce capability from the Terminfo for that terminal type, the 
problem goes away. This workaround involves:
  "infocmp xterm-256color > xt.ti" to get the Terminfo data in text format.
  Editing xt.ti and removing "bce, " on the 3rd line
  "tic xt.ti" to compile this text to Terminfo again. Without sudo that ends up 
in ~/.terminfo, overriding the system's entry, and with sudo it would overwrite 
the system's Terminfo entry for that terminal type.

  Another workaround would be to use a different terminal type without
  bce, like TERM=screen, but removing bce is better because that leaves
  other capabilities intact.

  ProblemType: Bug
  DistroRelease: Ubuntu 16.10
  Package: gnome-terminal 3.20.2-1ubuntu5
  ProcVersionSignature: Ubuntu 4.8.0-45.48-generic 4.8.17
  Uname: Linux 4.8.0-45-generic x86_64
  NonfreeKernelModules: nvidia_uvm nvidia
  ApportVersion: 2.20.3-0ubuntu8.2
  Architecture: amd64
  CurrentDesktop: XFCE
  Date: Fri Mar 31 13:49:01 2017
  SourcePackage: gnome-terminal
  UpgradeStatus: Upgraded to yakkety on 2016-10-13 (169 days ago)

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