Description

This is just a followup for this MR #2151 and it uses the right tool for the job, making the code also more consistent across JS/Python code.

Changes

• use insertAdjacentHTML instead of innerHTML +=
• test everything works fine

PyEditor test:

# doubled a
i = 0
while i < 5:
    i = i + 1
    print(i)
    import asyncio
    await asyncio.sleep(1)

# this append an error without trashing the layout
print(shenanigans)

Checklist

• All tests pass locally
• I have updated CHANGELOG.md
• I have created documentation for this(if applicable)