[calligra] Notify when a spreadsheet canvas item needs to be redrawn.…

… Contributes to JB#42697

rpm/calligra-invalidate-cache.patch

@@ -1,12 +1,36 @@
-From ade89d081f50bc4d7c8da63fd5da1f62c3e3e442 Mon Sep 17 00:00:00 2001
+From 3bd0ee6215b699b1249d25e91da53026cb5c9420 Mon Sep 17 00:00:00 2001
 From: Andrew den Exter <andrew.den.exter@qinetic.com.au>
 Date: Mon, 13 May 2019 03:24:40 -0400
-Subject: [PATCH 2/2] Update the document cache when an image is reloaded.
+Subject: [PATCH 01/12] Update the document cache when an image is reloaded.
 
 ---
+ sheets/part/CanvasItem.h    | 5 +++--
  words/part/KWCanvasItem.cpp | 2 +-
- 1 file changed, 1 insertion(+), 1 deletion(-)
+ 2 files changed, 4 insertions(+), 3 deletions(-)
 
+diff --git a/sheets/part/CanvasItem.h b/sheets/part/CanvasItem.h
+index 9497292..feebf02 100644
+--- a/sheets/part/CanvasItem.h
++++ b/sheets/part/CanvasItem.h
+@@ -121,6 +121,7 @@ public Q_SLOTS:
+ Q_SIGNALS:
+     /* virtual */ void documentSizeChanged(const QSize&);
+     void obscuredRangeChanged(const Calligra::Sheets::Sheet* sheet, const QSize&);
++    void canvasUpdated();
+
+ public:
+     virtual void mousePressEvent(QGraphicsSceneMouseEvent* _ev);
+@@ -170,8 +171,8 @@ public:
+     virtual void setVertScrollBarPos(qreal) {}
+     virtual void setHorizScrollBarPos(qreal) {}
+
+-    virtual void update() { QGraphicsWidget::update(); }
+-    virtual void update(const QRectF& rect) { QGraphicsWidget::update(rect); }
++    virtual void update() { QGraphicsWidget::update(); emit canvasUpdated(); }
++    virtual void update(const QRectF& rect) { QGraphicsWidget::update(rect); emit canvasUpdated(); }
+     virtual Qt::LayoutDirection layoutDirection() const { return QGraphicsWidget::layoutDirection(); }
+     virtual QRectF rect() const { return QGraphicsWidget::rect(); }
+     virtual QSizeF size() const { return QGraphicsWidget::size(); }
 diff --git a/words/part/KWCanvasItem.cpp b/words/part/KWCanvasItem.cpp
 index 18f5b40..0885708 100644
 --- a/words/part/KWCanvasItem.cpp