[Qt-creator] R.I.P. for QPlainTextEdit in Qr Creator 17?

[Henry Skoglund]

Hi, just updated to Qt Creator 17 and it looks good, however when 
rebuilding my Qt Creator plugin I got stuck for a bit with this failing:

   auto pe = 
qobject_cast<QPlainTextEdit*>(EditorManager::currentEditor()->widget());

For almost 15 years that statement served me well and it allowed for 
example setting a fatter cursor at Qt Creator start (useful on 4K 
screens) but today, it returns a nullptr :-(


Instead, the new incantation for Qt Creator 17 (and onwards?) seems to be:

   auto pe = 
qobject_cast<Utils::PlainTextEdit*>(EditorManager::currentEditor()->widget());

After that fix, it's smooth sailing (Utils::PlainTextEdit behaves 100% 
compatible with QPlainTextEdit).

But if there was a bit of documentation of this new class in the Utils:: 
Namespace I would be even more happy!
Rgrds Henry