For a CPDF_Color object, when set a new pattern to it, disconnect its link with the old pattern

core/src/fpdfapi/fpdf_page/fpdf_page_colors.cpp

Index: core/src/fpdfapi/fpdf_page/fpdf_page_colors.cpp
diff --git a/core/src/fpdfapi/fpdf_page/fpdf_page_colors.cpp b/core/src/fpdfapi/fpdf_page/fpdf_page_colors.cpp
index 8cd26fee377f9faa3b5724099877a25b4b87d245..6c2701f5f703dce656baa81280aabf73a55d3821 100644
--- a/core/src/fpdfapi/fpdf_page/fpdf_page_colors.cpp
+++ b/core/src/fpdfapi/fpdf_page/fpdf_page_colors.cpp
@@ -1326,6 +1326,7 @@ void CPDF_Color::SetValue(CPDF_Pattern* pPattern, FX_FLOAT* comps, int ncomps)
     PatternValue* pvalue = (PatternValue*)m_pBuffer;
     if (pvalue->m_pPattern && pvalue->m_pPattern->m_pDocument) {
         pDocPageData = pvalue->m_pPattern->m_pDocument->GetPageData();
+        pvalue->m_pPattern->SaveColor(NULL);
         pDocPageData->ReleasePattern(pvalue->m_pPattern->m_pPatternObj);
     }
     pvalue->m_nComps = ncomps;