Improve KReportExample main window by combining designer and preview widgets

Authored by staniek on Sep 16 2016, 8:27 AM.

Description

Improve KReportExample main window by combining designer and preview widgets

Summary:
Improve KReportExample main window by combining designer and preview widgets.
Save/restore visual state of KReportExample.
Show preview at startup in KReportExample.
Set layout of KReportView to 0, it's a QWidget so that's better default
Rename designerwindow to DesignerWidget.

Test Plan: Run the report example, make some clicks.

Reviewers: piggz

Subscribers: Kexi-Devel-list

Tags: KReport

Differential Revision: https://phabricator.kde.org/D2795