Implemented hovering in FilesystemWidget

Hovering over dirs and pictures show either the content of the directory
or a scaled image of the picture. This is a strange commit, though. When
the archive was the last opened tab the program crashes when changing to
FilesystemView. I don't have the slightest clue, why, so I simply
removed setting the last opened tab on startup.

Also there is some strange behavior regarding the position of the
HoverWindow and what Qt thinks the global position is...

1 files changed, 3 insertions, 0 deletions

diff --git a/filestreewidget.cpp b/filestreewidget.cpp
index 1181c21..dad3724 100644
--- a/filestreewidget.cpp
+++ b/filestreewidget.cpp
@@ -295,6 +295,9 @@ bool FilesTreeView::event(QEvent *e){
 	}
 	QModelIndex curIdx;
 	QHoverEvent *hEvent = static_cast<QHoverEvent*>(e);
+	if(!hEvent){
+		return true;
+	}
 	QPoint hotSpot(hEvent->pos().x(), hEvent->pos().y() - SmGlobals::instance()->cursorOffset());
 	QPoint globalPos = mapToGlobal(hotSpot);
 	QPoint where = globalPos + QPoint(30, 0);