Support saving file in case of a missing workbookView

Note that Google Sheets sometimes saves a file without workbookView even
if a worksheet has a sheetView.

Fixes #6

Author: m7913d

source/detail/serialization/xlsx_producer.cpp

@@ -2365,16 +2365,24 @@ void xlsx_producer::write_worksheet(const relationship &rel)
         write_start_element(xmlns, "sheetViews");
         write_start_element(xmlns, "sheetView");
 
-        const auto wb_view = source_.view();
         const auto view = ws.view();
 
         if (!view.show_grid_lines())
         {
             write_attribute("showGridLines", write_bool(view.show_grid_lines()));
         }
 
-        if ((wb_view.active_tab.is_set() && (ws.id() - 1) == wb_view.active_tab.get())
-            || (!wb_view.active_tab.is_set() && ws.id() == 1))
+        if (source_.has_view())
+        {
+            const auto wb_view = source_.view();
+
+            if ((wb_view.active_tab.is_set() && (ws.id() - 1) == wb_view.active_tab.get())
+                || (!wb_view.active_tab.is_set() && ws.id() == 1))
+            {
+                write_attribute("tabSelected", write_bool(true));
+            }
+        }
+        else if (ws.id() == 1)
         {
             write_attribute("tabSelected", write_bool(true));
         }

tests/data/Issue6_google_missing_workbookView.xlsx

@@ -74,6 +74,7 @@ class serialization_test_suite : public test_suite
         register_test(test_formatting);
         register_test(test_active_sheet);
         register_test(test_locale_comma);
+        register_test(test_Issue6_google_missing_workbookView);
     }
 
     bool workbook_matches_file(xlnt::workbook &wb, const xlnt::path &file)
@@ -824,6 +825,13 @@ class serialization_test_suite : public test_suite
         xlnt_assert_equals(ws.cell("A1").value<double>(), 1.9999999999);
         xlnt_assert_equals(ws.cell("A2").value<double>(), 1.1);
     }
+
+    void test_Issue6_google_missing_workbookView()
+    {
+        xlnt::workbook wb;
+        wb.load(path_helper::test_file("Issue6_google_missing_workbookView.xlsx"));
+        xlnt_assert_throws_nothing(wb.save("temp.xlsx"));
+    }
 };
 
 static serialization_test_suite x;