Block selection was "broken" when using tabs, or rather
incomplete: It treated tabs as normal characters, which
has shown to be unexpected by people using tabs in code.
The new implementation has a vastly improved find scope
as well. In addition, creating a blog selection with
mouse or keyboard feels a lot more solid now, as the
actual selection is detached from possible valid cursor
positions.
Task-number: QTCREATORBUG-1541
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
If the first or last line in a selection ended up with nothing to
highlight after whitespaces were trimmed, they'd use a codepath that
only works correctly for inner 'empty' lines.
Instead we now make sure the beginning and end of a selection are always
highlighted.
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.
