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Reviewed-by: dt

Fix the use of appendPlainText for automatic scrolling.

There is not much sense to have Ok and Cancel button that just close
the dialog, so instead there should be a Close button and a button to
switch to the currently selected session.

Reviewed-by: dt

This removes the all hard dependencies to and from welcome screen,
except the one to the core plugin. More in detail:

- Add IWelcomePage to add a tab to the welcome screen
- Move tabs in the modules where they belong
- Enables QHelpManager to open help fullscreen and contextually
- "Getting Started" moves to Qt4ProjectManager
- Projects & Sessions (aka "Develop") moves to ProjectExplorer
- "Community" remains in the welcome plugin for simplicity

Removing the last project did set startupproject to zero and unloaded
the project. Thus the check that the project for the current item and
the startup project are both null and the same.

On the Project Mode. Might fix a bug hjk found, which i can't reproduce.

Reviewed-by: dt

To avoid neverending line edits, make it look more compact.

Task-Nr: 257986

Hides the gory details, and in most cases the user doesn't care anyway.

Not finished 100%

Enough people want that, and it's not much code.

Task-Nr: 254138

Reviewed-by: Jens Bache-Wiig

Commit ac8e3714 did reorder the path list in
ProjectWizardPage, while ProjceFileWizardExtension still assumed
that the list displayed to the user is exactly the same as passed
to ProjectWizardPage.

The patch removes the index based communication between the
classes altogether and directly stores the ProjectNode in the
UserRole of the ComboBox entry.

Merge-request: 543
Reviewed-by: dt <qtc-committer@nokia.com>

Requires a lot of trivial forwarding.

Fixing 40ff6ab2

There were both variants, with and without extra semicolon.

Scroll areas were added to the welcome mode and the project mode, to
make sure they don't limit how small Qt Creator can be made.

Done with mae