BorderlineFix: Fixed visual updates when scrolling

For Cells with DoubleLine the connections to perpendicular
DoubleLine-Styles may have to be displayed in a Cell which
is 'around' the orig cell in a Cell-Border of one. To represent
that and to avoid repaint errors when scrolling in, the preparation
of Primitives has to take accordingly more neighbour cells into
account. Tested this change with the usages in Calc, UI (Dialogs)
and Calc exports Print/PrintPreview/PDF. This does not affect
Tables in Writer and/or Draw/Impress.

Change-Id: I3bcc68cdf7b4fc1825a87a9773892c359421024e

svx/source/dialog/framelinkarray.cxx

@@ -1061,18 +1061,39 @@ drawinglayer::primitive2d::Primitive2DContainer Array::CreateB2DPrimitiveRange(
     DBG_FRAME_CHECK_COLROW( nFirstCol, nFirstRow, "CreateB2DPrimitiveRange" );
     DBG_FRAME_CHECK_COLROW( nLastCol, nLastRow, "CreateB2DPrimitiveRange" );
 
+    // It may be necessary to extend the loop ranges by one cell to the outside,
+    // when possible. This is needed e.g. when there is in Calc a Cell with an
+    // upper CellBorder using DoubleLine and that is right/left connected upwards
+    // to also DoubleLine. These upper DoubleLines will be extended to meet the
+    // lower of the upper CellBorder and thus have graphical parts that are
+    // displayed one cell below and right/left of the target cell - analog to
+    // other examples in all other directions.
+    // It would be possible to explicitely test this (if possible by indices at all)
+    // looping and testing the styles in the outer cells to detect this, but since
+    // for other usages (e.g. UI) usually nFirstRow==0 and nLastRow==GetRowCount()-1
+    // (and analog for Col) it is okay to just expand the range when available.
+    // Do *not* change nFirstRow/nLastRow due to these needed to the boolean tests
+    // below (!)
+    // Checked usages, this method is used in Calc EditView/Print/Export stuff and
+    // in UI (Dialog), not for Writer Tables and Draw/Impress tables. All usages
+    // seem okay with this change, so I will add it.
+    const size_t nStartRow(nFirstRow > 0 ? nFirstRow - 1 : nFirstRow);
+    const size_t nEndRow(nLastRow < GetRowCount() - 1 ? nLastRow + 1 : nLastRow);
+    const size_t nStartCol(nFirstCol > 0 ? nFirstCol - 1 : nFirstCol);
+    const size_t nEndCol(nLastCol < GetColCount() - 1 ? nLastCol + 1 : nLastCol);
+
     // various primitive sequences to collect the different border types
     drawinglayer::primitive2d::Primitive2DContainer aHorizontalSequence;
-    std::vector< drawinglayer::primitive2d::Primitive2DContainer > aVerticalSequences(nLastCol - nFirstCol + 1);
+    std::vector< drawinglayer::primitive2d::Primitive2DContainer > aVerticalSequences(nEndCol - nStartCol + 1);
     drawinglayer::primitive2d::Primitive2DContainer aCrossSequence;
 
     // remember for which merged cells crossed lines were already created. To
     // do so, hold the size_t cell index in a set for fast check
     std::set< size_t > aMergedCells;
 
-    for (size_t nRow = nFirstRow; nRow <= nLastRow; ++nRow)
+    for (size_t nRow(nStartRow); nRow <= nEndRow; ++nRow)
     {
-        for (size_t nCol = nFirstCol; nCol <= nLastCol; ++nCol)
+        for (size_t nCol(nStartCol); nCol <= nEndCol; ++nCol)
         {
             // get Cell and CoordinateSystem (*only* for this Cell, do *not* expand for
             // merged cells (!)), check if used (non-empty vectors)
@@ -1139,7 +1160,7 @@ drawinglayer::primitive2d::Primitive2DContainer Array::CreateB2DPrimitiveRange(
 
                     if(rLeft.IsUsed())
                     {
-                        HelperCreateVerticalEntry(*this, rLeft, nCol, nRow, aOrigin, aX, aY, aVerticalSequences[nCol - nFirstCol], true, pForceColor);
+                        HelperCreateVerticalEntry(*this, rLeft, nCol, nRow, aOrigin, aX, aY, aVerticalSequences[nCol - nStartCol], true, pForceColor);
                     }
                 }
 
@@ -1151,7 +1172,7 @@ drawinglayer::primitive2d::Primitive2DContainer Array::CreateB2DPrimitiveRange(
 
                     if(rRight.IsUsed())
                     {
-                        HelperCreateVerticalEntry(*this, rRight, nCol + 1, nRow, aOrigin, aX, aY, aVerticalSequences[nCol - nFirstCol], false, pForceColor);
+                        HelperCreateVerticalEntry(*this, rRight, nCol + 1, nRow, aOrigin, aX, aY, aVerticalSequences[nCol - nStartCol], false, pForceColor);
                     }
                 }