From 037d2c9984880065bf8a7e5d189aac1c670e531b Mon Sep 17 00:00:00 2001
From: Anton Kreuzkamp <anton.kreuzkamp@kdab.com>
Date: Mon, 3 Dec 2018 15:01:36 +0100
Subject: [PATCH] KItemListWidget: Use initStyleOption

Instead of using QStyleOption::initFrom, let's use
QGraphicsWidget::initStyleOption, which is made for exactly the purpose
of KItemListWidget. This is especially important since, according to the
docs of QGraphicsItem::paint "The widget argument is optional. [...]
For cached painting, widget is always 0.". Even though currently no code
in dolphin does cached painting, for the sake of modularity one should
not rely on widget to be non-null. Using QStyleOption::initFrom does
assume that, though.

In fact, GammaRay asks the items to do cached painting when attaching it
to the application, causing it to crash.
---
 src/kitemviews/kitemlistview.cpp   | 2 +-
 src/kitemviews/kitemlistwidget.cpp | 6 +++---
 2 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/src/kitemviews/kitemlistview.cpp b/src/kitemviews/kitemlistview.cpp
index 316daa88d1..9f1380c75c 100644
--- a/src/kitemviews/kitemlistview.cpp
+++ b/src/kitemviews/kitemlistview.cpp
@@ -670,7 +670,7 @@ void KItemListView::paint(QPainter* painter, const QStyleOptionGraphicsItem* opt
         }
 
         QStyleOptionRubberBand opt;
-        opt.initFrom(widget);
+        initStyleOption(&opt);
         opt.shape = QRubberBand::Rectangle;
         opt.opaque = false;
         opt.rect = rubberBandRect.toRect();
diff --git a/src/kitemviews/kitemlistwidget.cpp b/src/kitemviews/kitemlistwidget.cpp
index 28b374620c..e8482216d5 100644
--- a/src/kitemviews/kitemlistwidget.cpp
+++ b/src/kitemviews/kitemlistwidget.cpp
@@ -127,7 +127,7 @@ void KItemListWidget::paint(QPainter* painter, const QStyleOptionGraphicsItem* o
 
     if (m_current && m_editedRole.isEmpty()) {
         QStyleOptionFocusRect focusRectOption;
-        focusRectOption.initFrom(widget);
+        initStyleOption(&focusRectOption);
         focusRectOption.rect = textFocusRect().toRect();
         focusRectOption.state = QStyle::State_Enabled | QStyle::State_Item | QStyle::State_KeyboardFocusChange;
         if (m_selected) {
@@ -517,11 +517,11 @@ void KItemListWidget::clearHoverCache()
 void KItemListWidget::drawItemStyleOption(QPainter* painter, QWidget* widget, QStyle::State styleState)
 {
     QStyleOptionViewItem viewItemOption;
-    viewItemOption.initFrom(widget);
+    initStyleOption(&viewItemOption);
     viewItemOption.state = styleState;
     viewItemOption.viewItemPosition = QStyleOptionViewItem::OnlyOne;
     viewItemOption.showDecorationSelected = true;
     viewItemOption.rect = selectionRect().toRect();
-    widget->style()->drawPrimitive(QStyle::PE_PanelItemViewItem, &viewItemOption, painter, widget);
+    style()->drawPrimitive(QStyle::PE_PanelItemViewItem, &viewItemOption, painter, widget);
 }