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This is a follow-up of commit 74121503

It is problematic to use "isEmpty()" to check whether the information
has been read. That would defeat the purpose of reading it only once
when the user has explicitly set that list as empty.

It is decided to not reimplement this feature in KDE4 konsole:

  * It is non-trivial work to implement it correctly
  * It annoyed some users when it was available in KDE3 konsole
  * Not many users want this feature back

This is a follow up of commit cee0ce53

CCBUG:172271
REVIEW:104156

That _emulation must have been initialized in the constructor.

That change was incidentally overwritten by commit 08de49 later.

It is weird that the old code used background color of character to look
up font weight.

CCMAIL: adaptee@gmail.com
CCMAIL: kurt.hindenburg@gmail.com