Project with Sample Track as last track always prompts for a save

[zonkmachine]

Bug Summary

When you close a project which has the last track being a sample track, that hasn't been changed, lmms will prompt for a save.

Steps to reproduce

• Load a project with only a Sample Track in it or where the last track is a sample track. It doesn't need to have a sample loaded.
• Close lmms

Expected behavior

If you open a project and then close lmms immediately without doing anything else, lmms should not prompt for a save unless it has recovered a project from an earlier crash.

Affected versions

This issue is on master only and it's present on 8a52ddb. I didn't look further back.

[zonkmachine]

Update. This is only an issue if there are only sample tracks in the project.

[PhysSong]

It happens if and only if the last track is a sample track. If the last track is a sample track, SampleTrack::createView() is called after loading the project(otherwise it's handled in the QCoreApplication::processEvents() call in TrackContainer::loadSettings()).
Unlike instrument tracks which creates InstrumentTrackWindow when opening the instrument the first time, SampleTrack::createView() creates a SampleTrackWindow instance and SampleTrackWindow::updateName() sets the text in m_nameLineEdit and it marks the song as modified.

[zonkmachine]

@PhysSong Thanks! I have updated the description and the title to reflect your findings.