Fix code block syntax highlighting not updating when changing its language

[Abdulrehman-Jafer]

Fixes #2222

[thecodrr]

@Abdulrehman-Jafer editor tests are failing.

[thecodrr]

This solution might work but needs fixes. Also please add tests for this.

[thecodrr]

Not ready yet.

[Abdulrehman-Jafer]

Still returning "No need to register" instead of false which I think is enhancing performance. But if this not feel right to you I can remove it,

[thecodrr]

@Abdulrehman-Jafer you need to add tests for this.

[Abdulrehman-Jafer]

This will regenerate the other bug that I solved which was language was not applying when user create a new Block and select a language for the first time and user had to select the language for second time to select the language. After debugging I found out that the reason of it was the first time codeblock id was undefined.

[thecodrr]

@Abdulrehman-Jafer

This will regenerate the other bug that I solved which was language was not applying when user create a new Block and select a language for the first time and user had to select the language for second time to select the language. After debugging I found out that the reason of it was the first time codeblock id was undefined.

That's why tests are important.