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If a plugin requests asyncronous shutdown, the shutdown sequence does
not continue to deleting the plugins before it has sent a
asynchronousShutdownFinished signal. During that time an event loop
is running.

A mostly mechanical change.

Reviewed-By: con

 * The standard says all preprocessor directives have to start
   at column 0.

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.

For :ex commands, the plugin is now asked first unconditionally.
The handler only provides fallbacks for the standalone case.

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>

Some categories do not have icons yet, unfortunately.

fakevim: map ctrl-] (follow tag in vim) to "Follow symbol under cursor" and ctrl-t (move up in tag stack) to "Go Back"

Merge-request: 131
Reviewed-by: hjk <qtc-committer@nokia.com>

disabled default actions are set to an empty regex pattern (which would match
any command)

Merge-request: 131
Reviewed-by: hjk <qtc-committer@nokia.com>