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This still needs a lot of work and sanitizing.

Reviewed-by: hjk

Not very nice, because it overrides platform behaviour.
The alternatives seem uglier, though.

Task-number: QTCREATORBUG-2860

Task-number: QTCREATORBUG-2423

Task-number: QTCREATORBUG-2753

When searching the search result window the current item was ignored in
the search instead of potentially being the first match.

Task-number: QTCREATORBUG-2753

Adds a showWrapIndicator(parent) method to IFindSupport, to be used by
implementations. First implementation is given for the BaseFindSupport
that's used for all searches in Q(Plain)TextEdits.

Task-number: QTCREATORBUG-2753

Now rendering is only happen if no changes happen anymore.

Reviewed-by: Christian Kamm

Reviewed-by: Christian Kamm

We have a proper fix for 2.2.

Task-number: QTCREATORBUG-3486

Task-Nr: QTCREATORBUG-2723

 * Move the environment model code to utils and export it
 * rename the environmenteditmodel files to environmentwidget
   (which is the class they actually contain)

Reviewed-by: dt

Introduced by recent ProxyAction refactoring, we may not copy the actual
enabled/visible/checked state during initialization.