Clear the data when the model resets.

This patch does a few things:
1 - reset the model when user closes the dive file
2 - connects the 'rowsAboutToBeRemoved' in a way that the graphics can
    remove their polygons too
3 - adds a 'clear' virtual method so items that don't follow the rules can
    clean themseves up.

Signed-off-by: Tomaz Canabrava <tcanabrava@kde.org>
Signed-off-by: Dirk Hohndel <dirk@hohndel.org>

1 files changed, 1 insertions, 0 deletions

diff --git a/qt-ui/profile/diveplotdatamodel.cpp b/qt-ui/profile/diveplotdatamodel.cpp
index 2f81999c2..3c89e81e7 100644
--- a/qt-ui/profile/diveplotdatamodel.cpp
+++ b/qt-ui/profile/diveplotdatamodel.cpp
@@ -99,6 +99,7 @@ void DivePlotDataModel::clear()
 {
 	if (rowCount() != 0) {
 		beginRemoveRows(QModelIndex(), 0, rowCount() - 1);
+		pInfo.nr = 0;
 		endRemoveRows();
 	}
 }