tdf#96943 sw Hide Whitespace: don't create pages for widow / orphan ...

... paragraphs that would otherwise fit nominal size of the page frame

Change-Id: I90c3de9150b17c951e1ac4158babb7a71afee9ee

sw/qa/extras/uiwriter/uiwriter.cxx

@@ -177,6 +177,7 @@ public:
     void testTdf77014();
     void testTdf92648();
     void testTdf96515();
+    void testTdf96943();
     void testTdf96536();
     void testTdf96479();
 
@@ -262,6 +263,7 @@ public:
     CPPUNIT_TEST(testTdf77014);
     CPPUNIT_TEST(testTdf92648);
     CPPUNIT_TEST(testTdf96515);
+    CPPUNIT_TEST(testTdf96943);
     CPPUNIT_TEST(testTdf96536);
     CPPUNIT_TEST(testTdf96479);
     CPPUNIT_TEST_SUITE_END();
@@ -2945,6 +2947,23 @@ void SwUiWriterTest::testTdf96515()
     CPPUNIT_ASSERT_EQUAL(1, getPages());
 }
 
+void SwUiWriterTest::testTdf96943()
+{
+    // Enable hide whitespace mode.
+    SwDoc* pDoc = createDoc("tdf96943.odt");
+    SwWrtShell* pWrtShell = pDoc->GetDocShell()->GetWrtShell();
+    SwViewOption aViewOptions(*pWrtShell->GetViewOptions());
+    aViewOptions.SetHideWhitespaceMode(true);
+    pWrtShell->ApplyViewOptions(aViewOptions);
+
+    // Insert a new character at the end of the document.
+    pWrtShell->SttEndDoc(/*bStt=*/false);
+    pWrtShell->Insert("d");
+
+    // This was 2, a new page was created for the new layout line.
+    CPPUNIT_ASSERT_EQUAL(1, getPages());
+}
+
 void SwUiWriterTest::testTdf96536()
 {
     // Enable hide whitespace mode.

sw/source/core/text/widorp.cxx

@@ -37,6 +37,10 @@
 #include "itrtxt.hxx"
 #include "sectfrm.hxx"
 #include "ftnfrm.hxx"
+#include "rootfrm.hxx"
+#include "viewopt.hxx"
+#include "pagefrm.hxx"
+#include "fmtfsize.hxx"
 
 #undef WIDOWTWIPS
 
@@ -126,8 +130,24 @@ bool SwTextFrameBreak::IsInside( SwTextMargin &rLine ) const
         // The Frame has a height to fit on the page.
         SwTwips nHeight =
             (*fnRect->fnYDiff)( (m_pFrame->GetUpper()->*fnRect->fnGetPrtBottom)(), m_nOrigin );
+        SwTwips nDiff = nHeight - nLineHeight;
+
+        SwViewShell* pShell = m_pFrame->getRootFrame()->GetCurrShell();
+        if (pShell && pShell->GetViewOptions()->IsWhitespaceHidden())
+        {
+            if (nDiff < 0)
+            {
+                SwPageFrame* pPageFrame = m_pFrame->FindPageFrame();
+                const SwFrameFormat* pPageFormat = static_cast<const SwFrameFormat*>(pPageFrame->GetRegisteredIn());
+                const Size& rPageSize = pPageFormat->GetFrameSize().GetSize();
+                long nWhitespace = rPageSize.getHeight() - pPageFrame->Frame().Height();
+                if (nWhitespace > -nDiff)
+                    nDiff = 0;
+            }
+        }
+
         // If everything is inside the existing frame the result is true;
-        bFit = nHeight >= nLineHeight;
+        bFit = nDiff >= 0;
 
         // --> OD #i103292#
         if ( !bFit )