sw btlr writing mode shell: fix cursor selection

All changes are about not assuming logical top is a lower y value than
logical bottom, by going via the SwRectFnSet abstraction, which already
does the right thing.

Change-Id: I94a9881b018ad14b02e97425f60af01aa3fd9269
Reviewed-on: https://gerrit.libreoffice.org/69226
Tested-by: Jenkins
Reviewed-by: Miklos Vajna <vmiklos@collabora.com>

sw/inc/swrect.hxx

@@ -23,6 +23,7 @@
 
 #include <sal/log.hxx>
 #include <tools/gen.hxx>
+#include "swdllapi.h"
 
 class SvStream;
 
@@ -30,7 +31,7 @@ class SvStream;
 /// This is half-open so m_Point.X() + m_Size.getWidth() is *not* included.
 /// Note the tools Rectangle is (usually? sometimes?) closed so there's a
 /// SVRect() to subtract 1 for the conversion.
-class SAL_WARN_UNUSED SwRect
+class SAL_WARN_UNUSED SW_DLLPUBLIC SwRect
 {
     Point m_Point;
     Size m_Size;

sw/qa/extras/layout/layout.cxx

@@ -2894,6 +2894,30 @@ void SwLayoutWriter::testBtlrCell()
     // Without the accompanying fix in place, this test would have failed: character position was 5,
     // i.e. cursor was at the end of the paragraph.
     CPPUNIT_ASSERT_EQUAL(static_cast<sal_Int32>(0), aPosition.nContent.GetIndex());
+
+    // Test that the selection rectangles are inside the cell frame if we select all the cell
+    // content.
+    SwTwips nCellLeft
+        = getXPath(pXmlDoc, "/root/page/body/tab/row/cell[1]/infos/bounds", "left").toInt32();
+    SwTwips nCellWidth
+        = getXPath(pXmlDoc, "/root/page/body/tab/row/cell[1]/infos/bounds", "width").toInt32();
+    SwTwips nCellTop
+        = getXPath(pXmlDoc, "/root/page/body/tab/row/cell[1]/infos/bounds", "top").toInt32();
+    SwTwips nCellHeight
+        = getXPath(pXmlDoc, "/root/page/body/tab/row/cell[1]/infos/bounds", "height").toInt32();
+    SwRect aCellRect(Point(nCellLeft, nCellTop), Size(nCellWidth, nCellHeight));
+    pWrtShell->SelAll();
+    SwShellCursor* pShellCursor = pWrtShell->getShellCursor(/*bBlock=*/false);
+    CPPUNIT_ASSERT(!pShellCursor->empty());
+    // Without the accompanying fix in place, this test would have failed with:
+    // selection rectangle 269x2573@(1970,2172) is not inside cell rectangle 3207x1134@(1593,1701)
+    // i.e. the selection went past the bottom border of the cell frame.
+    for (const auto& rRect : *pShellCursor)
+    {
+        std::stringstream ss;
+        ss << "selection rectangle " << rRect << " is not inside cell rectangle " << aCellRect;
+        CPPUNIT_ASSERT_MESSAGE(ss.str(), aCellRect.IsInside(rRect));
+    }
 #endif
 }
 

sw/source/core/layout/ssfrm.cxx

@@ -680,14 +680,15 @@ const SwRect SwFrame::UnionFrame( bool bBorder ) const
     long nWidth = (getFrameArea().*fnRect->fnGetWidth)();
     long nPrtLeft = (getFramePrintArea().*fnRect->fnGetLeft)();
     long nPrtWidth = (getFramePrintArea().*fnRect->fnGetWidth)();
-    if( nPrtLeft + nPrtWidth > nWidth )
+    SwRectFnSet aRectFnSet(this);
+    if (aRectFnSet.XInc(nPrtLeft, nPrtWidth) > nWidth)
         nWidth = nPrtLeft + nPrtWidth;
     if( nPrtLeft < 0 )
     {
         nLeft += nPrtLeft;
         nWidth -= nPrtLeft;
     }
-    SwTwips nRight = nLeft + nWidth;
+    SwTwips nRight = aRectFnSet.XInc(nLeft, nWidth);
     long nAdd = 0;
     if( bBorder )
     {
@@ -715,9 +716,9 @@ const SwRect SwFrame::UnionFrame( bool bBorder ) const
         if( nTmp > nAdd )
             nAdd = nTmp;
     }
-    nWidth = nRight + nAdd - nLeft;
+    nWidth = aRectFnSet.XDiff(aRectFnSet.XInc(nRight, nAdd), nLeft);
     SwRect aRet( getFrameArea() );
-    (aRet.*fnRect->fnSetPosX)( nLeft );
+    (aRet.*fnRect->fnSetLeft)(nLeft);
     (aRet.*fnRect->fnSetWidth)( nWidth );
     return aRet;
 }

sw/source/core/layout/trvlfrm.cxx

@@ -2138,6 +2138,7 @@ void SwRootFrame::CalcFrameRects(SwShellCursor &rCursor)
     SwRectFnSet aRectFnSet(pStartFrame);
     const bool bR2L = pStartFrame->IsRightToLeft();
     const bool bEndR2L = pEndFrame->IsRightToLeft();
+    const bool bB2T = pStartFrame->IsVertLRBT();
 
     // If there's no doubleline portion involved or start and end are both
     // in the same doubleline portion, all works fine, but otherwise
@@ -2370,7 +2371,7 @@ void SwRootFrame::CalcFrameRects(SwShellCursor &rCursor)
         {
             Point aTmpSt( aStRect.Pos() );
             Point aTmpEnd( aEndRect.Right(), aEndRect.Bottom() );
-            if( bSameRotatedOrBidi || bR2L )
+            if (bSameRotatedOrBidi || bR2L || bB2T)
             {
                 if( aTmpSt.Y() > aTmpEnd.Y() )
                 {