Qt: Fix QStyledItemDelegate assertions.

QStyledItemDelegate::paint asserts if you pass it an empty QModelIndex.
We were doing this in PercentBarDelegate and TimelineDelegate in order to
keep it from drawing any text. Return an empty string from ::displayText
instead, which appears to be the correct way to paint without text.

Bug: 13180
Change-Id: I8064d9575e04e95a926797eec7f6ad2b0bfef1c0
Reviewed-on: https://code.wireshark.org/review/19007
Reviewed-by: Gerald Combs <gerald@wireshark.org>
Petri-Dish: Gerald Combs <gerald@wireshark.org>
Reviewed-by: Michael Mann <mmann78@netscape.net>

1 files changed, 1 insertions, 1 deletions

diff --git a/ui/qt/percent_bar_delegate.cpp b/ui/qt/percent_bar_delegate.cpp
index 2a8ea0b2f2..358650ee5d 100644
--- a/ui/qt/percent_bar_delegate.cpp
+++ b/ui/qt/percent_bar_delegate.cpp
@@ -37,7 +37,7 @@ void PercentBarDelegate::paint(QPainter *painter, const QStyleOptionViewItem &op
 
     // Paint our rect with no text using the current style, then draw our
     // bar and text over it.
-    QStyledItemDelegate::paint(painter, option, QModelIndex());
+    QStyledItemDelegate::paint(painter, option, index);
 
     bool ok = false;
     double value = index.data(Qt::UserRole).toDouble(&ok);