Don't prepend namespace if it already exists in jelly

[timja]

What Operating System are you using?

.

Which IntelliJ IDEA version are you using?

2024.2.4

Reproduction steps

1. Example code:

<j:jelly xmlns:j="jelly:core" xmlns:st="jelly:stapler" xmlns:l="/lib/layout" xmlns:f="/lib/form">
  <f:readOnlyTextbox value="${it.publicIP}"/>
</jelly>

Select the readOnlyTextbox and type 'text', select textbox.
You will now have an extra namespace added:

<f:f:textbox value="${it.publicIP}"/>

Expected Results

<f:textbox value="${it.publicIP}"/>

Actual Results

<f:f:textbox value="${it.publicIP}"/>

Stack trace

No response

Anything else?

No response