Preserve spaces

[guillaume-goulet]

Hello,

Context

Currently org.dhatim.fastexcel.StringCache hardcodes the value of each t tag.
It means we cannot customise the attribute of this tag. By default, Excel trims the text values and we need to add the property xml:space="preserve" in order to not trim the text.

Example

sheet.value(0, "\nmy\nvalue\n") will be exported in a correct format but as soon as the file is opened by Excel with default settings the value will be equal to "my\nvalue"

Suggestion

You could add a boolean property to the org.dhatim.fastexcel.StringCache class
And update the write method to set the t tag with the correct attribute (<t xml:space="preserve">)
If it makes senses a customise attribute list could be added.