TextField fontsize changes after editing content

Feature requests, bug reports etc. are very welcome as issues. But questions are directed to stackoverflow with the tag jspdf.

If you are facing issues with utf-8 characters, please refer to #2677.

Note that bug reports should follow these guidelines:

1. A bug should be reported as an mcve
2. Make sure code is properly indented and formatted (Use ``` around code blocks)
3. You can run example here http://raw.githack.com/MrRio/jsPDF/master/ for AcroForms and download pdf and check the font size on chrome browser Initial font size for input value is ok when we chnge text it appear larger

/* global jsPDF */
var doc = new jsPDF();
var {
  TextField,
  Appearance
} = jsPDF.AcroForm;

doc.setFontSize(12);

doc.text("TextField:", 10, 145);
var textField = new TextField();
textField.Rect = [50, 140, 30, 10];
textField.multiline = false;
textField.value ="Test value"; //
textField.fieldName = "TestTextBox";
doc.addField(textField);

4. Please check ath attached Pdf and open it in chrome browser it show larger text inside input fields. AcroForms (2).pdf