Fix: skipped column style bug in StreamWriter's SetRow (qax-os#2235)

Author: radam9

stream.go

@@ -413,7 +413,7 @@ func (sw *StreamWriter) SetRow(cell string, values []interface{}, opts ...RowOpt
 		if err != nil {
 			return err
 		}
-		c := xlsxC{R: ref, S: sw.worksheet.prepareCellStyle(col, row, options.StyleID)}
+		c := xlsxC{R: ref, S: sw.worksheet.prepareCellStyle(col+i, row, options.StyleID)}
 		var s int
 		if v, ok := val.(Cell); ok {
 			s, val = v.StyleID, v.Value

stream_test.go

@@ -362,22 +362,35 @@ func TestStreamSetRowWithStyle(t *testing.T) {
 	blueStyleID, err := file.NewStyle(&Style{Font: &Font{Color: "0000FF"}})
 	assert.NoError(t, err)
 
-	streamWriter, err := file.NewStreamWriter("Sheet1")
+	sheetName := "Sheet1"
+	streamWriter, err := file.NewStreamWriter(sheetName)
 	assert.NoError(t, err)
+	assert.NoError(t, streamWriter.SetColStyle(1, 1, grayStyleID))
+	assert.NoError(t, streamWriter.SetColStyle(3, 3, blueStyleID))
 	assert.NoError(t, streamWriter.SetRow("A1", []interface{}{
-		"value1",
-		Cell{Value: "value2"},
-		&Cell{Value: "value2"},
-		Cell{StyleID: blueStyleID, Value: "value3"},
-		&Cell{StyleID: blueStyleID, Value: "value3"},
+		"A1",
+		Cell{Value: "B1"},
+		&Cell{Value: "C1"},
+		Cell{StyleID: blueStyleID, Value: "D1"},
+		&Cell{StyleID: blueStyleID, Value: "E1"},
 	}, RowOpts{StyleID: grayStyleID}))
+	assert.NoError(t, streamWriter.SetRow("A2", []interface{}{
+		"A2",
+		Cell{Value: "B2"},
+		&Cell{Value: "C2"},
+		Cell{StyleID: grayStyleID, Value: "D2"},
+		&Cell{StyleID: blueStyleID, Value: "E2"},
+	}))
 	assert.NoError(t, streamWriter.Flush())
 
-	ws, err := file.workSheetReader("Sheet1")
+	ws, err := file.workSheetReader(sheetName)
 	assert.NoError(t, err)
 	for colIdx, expected := range []int{grayStyleID, grayStyleID, grayStyleID, blueStyleID, blueStyleID} {
 		assert.Equal(t, expected, ws.SheetData.Row[0].C[colIdx].S)
 	}
+	for colIdx, expected := range []int{grayStyleID, 0, blueStyleID, grayStyleID, blueStyleID} {
+		assert.Equal(t, expected, ws.SheetData.Row[1].C[colIdx].S)
+	}
 }
 
 func TestStreamSetCellValFunc(t *testing.T) {