Add const version of getDocImport

Will need it for tdf#89597

Change-Id: I705d30422e2de9d5f75ac0c5c69c69ede05af48f

sc/source/filter/inc/workbookhelper.hxx

@@ -149,6 +149,7 @@ public:
     const ScDocument& getScDocument() const;
 
     ScDocumentImport& getDocImport();
+    const ScDocumentImport& getDocImport() const;
 
     ScEditEngineDefaulter& getEditEngine() const;
     /** Returns a reference to the source/target spreadsheet document model. */

sc/source/filter/oox/workbookhelper.cxx

@@ -794,6 +794,11 @@ ScDocumentImport& WorkbookHelper::getDocImport()
     return mrBookGlob.getDocImport();
 }
 
+const ScDocumentImport& WorkbookHelper::getDocImport() const
+{
+    return mrBookGlob.getDocImport();
+}
+
 ScEditEngineDefaulter& WorkbookHelper::getEditEngine() const
 {
     return mrBookGlob.getEditEngine();