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This commit replaces an error-prone usage of KIO::StatJob::exec() in DolphinView with the recommended KIO::StatJob::start(). The containing method DolphinView::statusBarText() is changed to be a method without return value: requestStatusBarText() The new status bar text is instead returned through a new setStatusBarText() signal that will be emitted asynchronously if necessary. The calling code that deals with status bar text is refactored to correctly work despite the new asynchronicity. The helper method calculateItemCount() is moved into requestStatusBarText() and some other code from requestStatusBarText() is moved into a new helper method emitStatusBarText(). The documentation of KIO::KJob::exec() explains why it should be avoided. A reproducible crash is the reason for this commit.
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