On Mac, QKeyEvent::text() returns non-empty strings for cursor keys. This
breaks some of the logic relying on text() being empty for "special" keys.

This is a quick fix to make it usable.

In theory this should have been a backport of the search-related commits
7e8c345a and 46fa3aa7, but they are buried in the middle of the Big
Commandline Reorganization. Just taking everything has lower risk and
is faster.

Reviewed-by: ossi

Reviewed-by: hjk

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

When copying text editor settings, put incremental search on true.

Reviewed-by: hjk

Also use spin boxes for the number inputs.

Reviewed-by: hjk

Reviewed-by: hjk

Merge-request: 132
Reviewed-by: hjk <qtc-committer@nokia.com>

Merge-request: 132
Reviewed-by: hjk <qtc-committer@nokia.com>

Merge-request: 132
Reviewed-by: hjk <qtc-committer@nokia.com>