#20 effects duration could be negative

[romgen]

1. add effect to clip ("Fade in")
2. play a bit with the clipline in the effects windows (bottom right)
3. effects length could be negative when moving far to the left

Solution:
Add the following lines to "SceneDetailView.cpp" at line 486:

if(duration<=0)
duration = 1;

Whole Function:

void SceneDetailEffectsPage::on_clipline_spanChanged(const Span& span)
{
int start = span.start();
int duration = span.duration();

if(duration<=0)
duration = 1;

m_model->setObjectProperty(m_effect->id(), "start", start);
m_model->setObjectProperty(m_effect->id(), "duration", duration);
//m_timeline->changeObject(m_clip, span.start(), span.duration());
}

Greetings and good work!