ITextEditorExtension.isEditorInputReadOnlyas read-only elements may be modifiable and writable elements may not be modifiable. If the given element is not connected to this document provider, the result is undefined. Document providers are allowed to use a cache to answer this question, i.e. there can be a difference between the "real" state of the element and the return value.
trueif the editor input is modifiable
trueif the input was validated,
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