Discussed-with: hjk

The Parentheses, TextBlockUserData and TextEditDocumentLayout classes
and their member function implementations were spread around the
BaseTextEditor class. Moving them to their own file to make the code a
bit better organized.

Reviewed-by: mae

Task-Nr: QTCREATORBUG-1151

Reviewed-by: mae

Allow include paths with any suffix, and do some sanity check for
existence of paths.

Reviewed-by: Thorbjørn Lindeijer

Reviewed-by: Jens Bache-Wiig

Task-number: QTCREATORBUG-1102
Reviewed-by: Roberto Raggi

Trying to clean up a little.

The fake tooltip duplication is not nice.

Reviewed-by: mae
Merge-request: 133

OK, it seems that this change is not necessary.

This reverts commit 40bae63c.

Done-with: Erik Verbruggen

Some categories do not have icons yet, unfortunately.

Done-with: Roberto Raggi

Go to About Plugins and enable/disable plugins from there.

Reviewed-by: mae

The problem was that for

Foo::Foo
(|)

when the user triggers completion at |, startOfLine() returns a token
that's not on the current line and not yet tokenized by that instance
of the BackwardScanner.

As a fix I explicitly ask the instance to tokenize up to the given
index.

Task-number: QTCREATORBUG-673
Reviewed-by: Roberto Raggi

Fixed crash in FindUsages on a dirty file in a large project, which is saved
while the FindUsages is still running.

Fixes QTCREATORBUG-787

Reviewed-by: Erik Verbruggen

Reviewed-by: Friedemann Kleint

Introduce multithread-locking to Core::MimeDatabase as it is
invoked from the indexer thread to sort apart headers and sources.
Add a convenience to operate on a sequence to avoid locking for each
file.

This reverts commit 2a59d2ae.