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still a few cases for chunked fetching missing

BaseTextEdit's paint event relied on us setting the line count of
invisible blocks to 0. This was not always the case, causing pixel
garbage to occur.

In combination with ifdef'ed-out blocks, the collapse block
indicator was sometimes painted with the ifdef'ed out color.

In combination with ifdef'ed out blocks (un)collapse all would
possibly never expand the blocks again.

Reviewed-By: con

And skip building before running for them.

Conflicts:
	src/plugins/cpptools/cppfindreferences.cpp
	src/plugins/cpptools/cpptoolsplugin.cpp
	src/plugins/texteditor/basefilefind.cpp

Acked-by: hjk <qtc-commiter@nokia.com>

(cherry picked from commit e187cb40)

(cherry picked from commit 53026537)

Reviewed-by: con

The changes enables the auto-parentheses magic of normal
backspace also for the DeleteStartOfWord case.