Fix for #11801: "Font Size" field on themes settings dialog could accept any characters

[geralexgr]

When the input field for font is not valid set the preferences in the default font size.

[ficristo]

This doesn't seem the right fix.
As suggested by @MiguelCastillo in the opening issue, have you tryed to add the pattern attribute to the html?
Something like pattern="^[\d\.]+(px|em)$"

[petetnt]

Thanks for contributing to Brackets @jerrak0s!

I think the pattern attribute could work, not sure if there's a premade size validation regexp though but the example @ficristo gave should be close enough after adding rems and so on.

@jerrak0s you can see the documentation on pattern here: https://developer.mozilla.org/en-US/docs/Web/HTML/Element/input#attr-pattern

[geralexgr]

My intention was to fix the wrong value in the textfield Font Size: after wrong input.
So when i save something wrong in the font Size, that is not saved.

[petetnt]

@jerrak0s Yup, and it's a good thing to do! With the pattern attribute however, you can ensure that users cannot write invalid values at all to the field 👍

[ficristo]

This needs more work. Closing for now.
The issue #11801 is still open.