[rhel7-branch] Two fixes for printing long widgets in TUI

[Vratislav Podzimek]

We need to better handle screen height, decrease the default value because of
serial consoles and do a better job when counting printed and missing lines.

Vratislav Podzimek (2):
  Improve how we set the default screen height in text mode (#1184378)
  Fix the line counting when printing long widgets

pyanaconda/constants_text.py         |  3 +++
 pyanaconda/ui/tui/simpleline/base.py | 17 +++++++++++++----
 2 files changed, 16 insertions(+), 4 deletions(-)