Height of Inline Edit input control used for editing does not scale with font size

To reproduce:

• Open http://build.fluidproject.org/infusion/demos/inlineEdit/
• Activate the first Inline Edit control "Edit this"
• Type "Ag"

Expected:

• To see all of the letters being typed

Actual:

• The top and bottom of the letters are cut off

This is visible on the Inline Edit demo page in Firefox as is but can also be made more dramatic by changing the font size in the CSS for the demo.