sw: LOK_CALLBACK_TEXT_SELECTION should be the union of all selections

E.g. if searching for a keyword and it's inside a text frame, then we
have two cursors: one is an empty selection at the anchor point, and the
other is the real selection. What happened is that we emitted two events
for the two cursors, instead of merging them together.

Fix the problem by not emitting the events in SwSelPaintRects::Show(),
instead do it at once in SwShellCrsr::Show().

Change-Id: Ie2c7691aaaea7ba8a32b5cfa718a45cba571f791

sw/inc/viscrs.hxx

@@ -96,7 +96,7 @@ public:
     // make a complete swap access to m_pCursorOverlay is needed there
     void swapContent(SwSelPaintRects& rSwap);
 
-    void Show();
+    void Show(std::vector<OString>* pSelectionRectangles = 0);
     void Hide();
     void Invalidate( const SwRect& rRect );
 

sw/source/core/crsr/viscrs.cxx

@@ -280,7 +280,7 @@ void SwShellCrsr::FillStartEnd(SwRect& rStart, SwRect& rEnd) const
     rEnd = lcl_getLayoutRect(pCursor->GetEndPos(), *pCursor->End());
 }
 
-void SwSelPaintRects::Show()
+void SwSelPaintRects::Show(std::vector<OString>* pSelectionRectangles)
 {
     SdrView *const pView = const_cast<SdrView*>(m_pCursorShell->GetDrawView());
 
@@ -379,7 +379,10 @@ void SwSelPaintRects::Show()
                 ss << rRect.SVRect().toString().getStr();
             }
             OString sRect = ss.str().c_str();
-            GetShell()->libreOfficeKitCallback(LOK_CALLBACK_TEXT_SELECTION, sRect.getStr());
+            if (!pSelectionRectangles)
+                GetShell()->libreOfficeKitCallback(LOK_CALLBACK_TEXT_SELECTION, sRect.getStr());
+            else
+                pSelectionRectangles->push_back(sRect);
         }
     }
 }
@@ -566,11 +569,31 @@ void SwShellCrsr::FillRects()
 
 void SwShellCrsr::Show()
 {
+    std::vector<OString> aSelectionRectangles;
     for(SwPaM& rPaM : GetRingContainer())
     {
         SwShellCrsr* pShCrsr = dynamic_cast<SwShellCrsr*>(&rPaM);
         if(pShCrsr)
-            pShCrsr->SwSelPaintRects::Show();
+            pShCrsr->SwSelPaintRects::Show(&aSelectionRectangles);
+    }
+
+    if (GetShell()->isTiledRendering())
+    {
+        std::stringstream ss;
+        bool bFirst = true;
+        for (size_t i = 0; i < aSelectionRectangles.size(); ++i)
+        {
+            const OString& rSelectionRectangle = aSelectionRectangles[i];
+            if (rSelectionRectangle.isEmpty())
+                continue;
+            if (bFirst)
+                bFirst = false;
+            else
+                ss << "; ";
+            ss << rSelectionRectangle.getStr();
+        }
+        OString sRect = ss.str().c_str();
+        GetShell()->libreOfficeKitCallback(LOK_CALLBACK_TEXT_SELECTION, sRect.getStr());
     }
 }