Incorrect browser validation message for number inputs

[colin-grant-work]

Bug Description:

For any preference number input, including those that should accept floats, a validation failure message is shown by the browser itself if a float is enterede:

Steps to Reproduce:

1. Enter a float in any field expecting a number.
2. Hover over the input.
3. Observe that the message above is shown.

The number input is created here. There, the type is set to number and no step is set. By default, that means that the step is 1, and fractional values will be treated as invalid by the browser.

One solution is to just add .step = 'any'. A more sophisticated solution would check whether the intended type of the input is integer or not and then set the step value approppriately.

Additional Information

• Operating System: Windows 10 / RHEL7
• Theia Version: 6b14f04