set and get row height，unit of measure are not uniform？！！！same with col width

[MichaelChen666]

the source code ：

	xlsx := excelize.NewFile()
	// 创建一个工作表
	index := xlsx.NewSheet("Sheet2")
	// 设置单元格的值
	xlsx.SetCellValue("Sheet2", "A2", "Hello world.")
	rowHeight := xlsx.GetRowHeight("Sheet2", 2)
	fmt.Println("the 2 row height: ", rowHeight)

	xlsx.SetCellValue("Sheet2", "A3", "Hello world.")
	xlsx.SetRowHeight("Sheet2", 3, 20)
	rowHeight = xlsx.GetRowHeight("Sheet2", 3)
	fmt.Println("the 3 row height: ", rowHeight)

	// 设置工作簿的默认工作表
	xlsx.SetActiveSheet(index)
	// 根据指定路径保存文件
	err := xlsx.SaveAs("./text.xlsx")
	if err != nil {
		fmt.Println(err)
	}

and the output：

the 2 row height:  20
the 3 row height:  20

I get the row height， it's 20, but I set another row to 20， and get 20. OK!!! but the result is not the same.

the actual row height is not the same. When setting row height， the unit of measure is the pound（Because the default unit of measurement of row height for Excel is pound）.
But if it is not set, the unit of return value is pixel.

See source code：

// GetRowHeight provides a function to get row height by given worksheet name
// and row index. For example, get the height of the first row in Sheet1:
//
//    xlsx.GetRowHeight("Sheet1", 1)
//
func (f *File) GetRowHeight(sheet string, row int) float64 {
	xlsx := f.workSheetReader(sheet)
	for _, v := range xlsx.SheetData.Row {
		if v.R == row && v.Ht != 0 {
			return v.Ht
		}
	}
	// Optimisation for when the row heights haven't changed.
	return defaultRowHeightPixels
}

// SetRowHeight provides a function to set the height of a single row. For
// example, set the height of the first row in Sheet1:
//
//    xlsx.SetRowHeight("Sheet1", 1, 50)
//
func (f *File) SetRowHeight(sheet string, row int, height float64) {
	xlsx := f.workSheetReader(sheet)
	cells := 0
	rowIdx := row - 1
	completeRow(xlsx, row, cells)
	xlsx.SheetData.Row[rowIdx].Ht = height
	xlsx.SheetData.Row[rowIdx].CustomHeight = true
}

So, there are two issues, one is:
In the function of GetRowHeight, the code should be if v.R == row && v.CustomHeight != false, It's better to write this way, but it doesn't matter.

the another one is:
the unit of measure of row height is not uniform。So when I insert images，you can see

source code is:

	xlsx := excelize.NewFile()

	file, err := ioutil.ReadFile("./photo.jpg")
	if err != nil {
		fmt.Println(err)
	}

	format := `{"x_scale": 0.1, "y_scale": 0.1, "lock_aspect_ratio": false, "locked": false, "positioning": "oneCell"}`

	xlsx.SetRowHeight("Sheet1", 2, 30)
	xlsx.AddPictureFromBytes("Sheet1", "A2", format, "Excel Logo", ".jpg", file)
	xlsx.SetRowHeight("Sheet1", 3, 30)
	xlsx.AddPictureFromBytes("Sheet1", "D2", format, "Excel Logo", ".jpg", file)
	xlsx.SetRowHeight("Sheet1", 4, 30)
	xlsx.AddPictureFromBytes("Sheet1", "G2", format, "Excel Logo", ".jpg", file)

	err = xlsx.SaveAs("./text.xlsx")
	if err != nil {
		fmt.Println(err)
	}

But, but, but,

source code:

	xlsx := excelize.NewFile()

	file, err := ioutil.ReadFile("./photo.jpg")
	if err != nil {
		fmt.Println(err)
	}

	format := `{"x_scale": 0.1, "y_scale": 0.1, "lock_aspect_ratio": false, "locked": false, "positioning": "oneCell"}`

	xlsx.SetRowHeight("Sheet1", 2, 30)
	xlsx.SetRowHeight("Sheet1", 3, 30)
	xlsx.SetRowHeight("Sheet1", 4, 30)
	xlsx.AddPictureFromBytes("Sheet1", "A2", format, "Excel Logo", ".jpg", file)
	xlsx.AddPictureFromBytes("Sheet1", "D2", format, "Excel Logo", ".jpg", file)
	xlsx.AddPictureFromBytes("Sheet1", "G2", format, "Excel Logo", ".jpg", file)

	err = xlsx.SaveAs("./text.xlsx")
	if err != nil {
		fmt.Println(err)
	}

it's so funny, ha！The logic of inserting pictures is problematic. When you insert the first picture, it’s ok! When you insert the second picture, you change the row height, and it's ok! But the first picture is not OK! The final effect should not be related to the order of setup. Do you think so?