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The new multiline string literals mixed things up.

Task-number: QTCREATORBUG-3244
Reviewed-by: Roberto Raggi

This is basically a continuation of the commits which
refactor code out of the base text editor. For instance,
36fa1de4 and
3a684586.

Also removed the doXXXX() forwarding methods.

Task-number: QTCREATORBUG-2155
Reviewed-by: Roberto Raggi

Reviewed-by: Thorbjorn Lindeijer