[Bug 1308723] Re: clear, after background_color command uses a black color and thus only colors a frame

[Yu Ning]

I noticed a very weird behavior by executing below commands in grub
console:

```
set pager=1

background_color 44,0,30

# from now on all the text will be printed with black background but not
color 44,0,30

help

# help will show a long list of commands, since we have set pager=1 then
it will first pause on the first page, all the text are displayed with
black background.

# then we press space to view next page, and we can notice that the background is now correctly set to color 44,0,30 instead of black.
```

It seems that some settings are not fully synced in command
background_color, but it's synced by the pager switching.

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https://bugs.launchpad.net/bugs/1308723

Title:
  clear, after background_color command uses a black color and thus only
  colors a frame

Status in “grub2” package in Ubuntu:
  Confirmed

Bug description:
  if background_color 44,0,30; then
    clear
  fi

  is what ubuntu-logo plymouth theme snippet injects into grub.cfg, this
  generates a purple one character frame whilst the center is black. It
  used to be all purple. i mean aubergine.

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