tdf#138600 sw: fix too small print area for btlr text in nested table

Regression from commit 435ab51ec8920033b7865f27f4afee8a852a0b31
(tdf#128399 sw btlr: fix clicking to lower rotated cell, 2019-10-29),
the bugdoc has a btlr table cell and the row frame of the outer table
has a bottom value which is very small at the point when
SwFrame::GetPaintArea() is invoked for the inner btlr cell.

This means the "cell should not leave its parent" mechanism kicks in and
reduces the bottom of the paint area to a small value, so the text is
not visible at all.

Fix the problem by teaching SwFrame::GetPaintArea() that btlr cell
frames are OK to leave their parent towards the bottom of the page; that
parent will grow at a later phase of the layout process anyway.

Change-Id: I99334bbf0116df8d8ed27f192c81c0441b6c797d
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/107730
Tested-by: Jenkins
Reviewed-by: Miklos Vajna <vmiklos@collabora.com>
Signed-off-by: Xisco Fauli <xiscofauli@libreoffice.org>
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/107787
Signed-off-by: Xisco Fauli <xiscofauli@libreoffice.org>
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/107818

3 files changed, 28 insertions, 1 deletions

diff --git a/sw/qa/core/layout/data/btlr-nested-cell.odt b/sw/qa/core/layout/data/btlr-nested-cell.odt
new file mode 100644
index 000000000000..ca7a4798db97
--- /dev/null
+++ b/sw/qa/core/layout/data/btlr-nested-cell.odt
diff --git a/sw/qa/core/layout/layout.cxx b/sw/qa/core/layout/layout.cxx
index 947152de49c6..6a6840f425a4 100644
--- a/sw/qa/core/layout/layout.cxx
+++ b/sw/qa/core/layout/layout.cxx
@@ -15,6 +15,8 @@
 #include <wrtsh.hxx>
 #include <IDocumentDrawModelAccess.hxx>
 #include <drawdoc.hxx>
+#include <IDocumentLayoutAccess.hxx>
+#include <rootfrm.hxx>
 
 static char const DATA_DIRECTORY[] = "/sw/qa/core/layout/data/";
 
@@ -171,6 +173,30 @@ CPPUNIT_TEST_FIXTURE(SwCoreLayoutTest, testTextBoxAutoGrowVertical)
     CPPUNIT_ASSERT(aShapeRect.IsInside(aFlyRect));
 }
 
+CPPUNIT_TEST_FIXTURE(SwCoreLayoutTest, testBtlrNestedCell)
+{
+    // Load a document with a nested table, the inner A1 cell has a btlr text direction.
+    load(DATA_DIRECTORY, "btlr-nested-cell.odt");
+    SwXTextDocument* pTextDoc = dynamic_cast<SwXTextDocument*>(mxComponent.get());
+    SwDoc* pDoc = pTextDoc->GetDocShell()->GetDoc();
+    SwRootFrame* pLayout = pDoc->getIDocumentLayoutAccess().GetCurrentLayout();
+    SwFrame* pPage = pLayout->GetLower();
+    SwFrame* pBody = pPage->GetLower();
+    SwFrame* pOuterTable = pBody->GetLower()->GetNext();
+    SwFrame* pInnerTable = pOuterTable->GetLower()->GetLower()->GetLower();
+
+    // Check the paint area of the only text frame in the cell.
+    SwFrame* pTextFrame = pInnerTable->GetLower()->GetLower()->GetLower();
+    long nFrameBottom = pTextFrame->getFrameArea().Bottom();
+    SwRect aPaintArea = pTextFrame->GetPaintArea();
+
+    // Without the accompanying fix in place, this test would have failed with:
+    // - Expected greater or equal than: 2829
+    // - Actual  : 2080
+    // i.e. part of the text frame area was not painted, hiding the actual text.
+    CPPUNIT_ASSERT_GREATEREQUAL(nFrameBottom, aPaintArea.Bottom());
+}
+
 CPPUNIT_PLUGIN_IMPLEMENT();
 
 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/sw/source/core/layout/ssfrm.cxx b/sw/source/core/layout/ssfrm.cxx
index 1a92144a5583..59d7d64afdd8 100644
--- a/sw/source/core/layout/ssfrm.cxx
+++ b/sw/source/core/layout/ssfrm.cxx
@@ -626,7 +626,8 @@ SwRect SwFrame::GetPaintArea() const
             pTmp->IsCellFrame() || pTmp->IsRowFrame() || //nobody leaves a table!
             pTmp->IsRootFrame() )
         {
-            if( bLeft || aRectFnSet.XDiff(nTmpLeft, nLeft) > 0 )
+            // BTLR is OK to expand towards the physical down direction. Physical down is left.
+            if( bLeft || (aRectFnSet.XDiff(nTmpLeft, nLeft) > 0 && !IsVertLRBT()) )
                 nLeft = nTmpLeft;
             if( bRight || aRectFnSet.XDiff(nRight, nTmpRight) > 0 )
                 nRight = nTmpRight;