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I did find two other places that invokes UpdatePreview in MainWindow that might be an issue for opening new tabs for the first time:
The first is when Preview is first shown, or when hidden and shown again:
connect(m_PreviewWindow, SIGNAL(Shown()), this, SLOT(UpdatePreview()));
That may explain the minimize and restore double pump.
And the second happens when a tab change is made to a new tab here:
connect(m_TabManager, SIGNAL(TabChanged(ContentTab *, ContentTab *)),
this, SLOT(UpdatePreview()));
So when a new tab is created and loaded and then changed to (or in the reverse order) , we can end up with preview update being loaded twice.
Hmm Perhaps that is an issue once for each tab, but after that changing between two loaded tabs we would need that signal as both have already been loaded.
But all of this happens in Sigil 1.3.0 as well so I am not sure why it is causing an issue now and not then.
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