Fix code marks trimming for different ides

[francescoopiccoli]

Problem

in our example mynah-ui we mark codeblock with ~~~~~~~~~~, different ides use ``` instead. This causes a small ui issue when navigating through prompts as the code blocks attached to previous prompts might not be trimmed correctly. More importantly, in this PR we make sure to remove the code marks ONLY if they appear at the very start of the codeAttachment, not the first occurrence. This issue could have potentially modified the user prompt if it contained an occurrence of ~~~~~~~~~~ while the code block was marked via the ``` marks. In that case navigating through prompts would have caused an input like:

void main() {
  print("~~~~~~~~~~");
  print("Hello World");
  print("Hello World");
}

to be transformed to

void main() {
  print("");
  print("Hello World");
  print("Hello World");
}

Solution

Tests

• I have tested this change on VSCode
• I have tested this change on JetBrains

License

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

[dogusata]

Please do not make a release with this one merged.