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Several special cases that are handled by the CPPEditor did not take
into account code that was using tab characters.

Task-number: QTCREATORBUG-292
Reviewed-by: Roberto Raggi

Encapsulate the details.

the new approach makes it possible to use more edit features
inside the rename selection like cut/copy/paste. Furthermore
it compresses rename operations better on the undo stack.

This handles the case with the selection inside the name correctly, and
aborts when part of the selection is outside of the name. Previously, a
selection could cause the text to get inserted backwards.

Task-number: QTCREATORBUG-302
Reviewed-by: Roberto Raggi

Remove overlap. Add extra selection tooltips for the cpp hover handler.

We need to port the code to use the new overloay system.

Now, the ASTVisitor constructor takes a valid reference to a TranslationUnit.

Done with Erik Verbruggen

Don't show the warning message (about the dangerous world of code refactoring) if the user pressed the "Yes, I know I am doing" button.

Reviewed-by: Thorbjørn Lindeijer <thorbjorn.lindeijer@nokia.com>

at a later stage we will look into harmonizing context menu among different editors.
The cpp editor had the biggest need, because its context menu features all sorts of
extra refactoring operations, thus the standard Qt context menu became too large.

It was not working for files opened while indexing the project.

Reviewed by: Roberto Raggi

Unfortunately, the MacroResolver does not scale and we get pretty bad performances when parsing big projects.