Dropdown summary is not properly rendered.

[alitajelsir]

Description

Dropdown summary is not properly rendered.

• Can you reproduce the issue?

Steps to reproduce

1. Create a dropdown summary using:

• 1st ex.:

<details>
    <summary>Test</summary>

- Test 1
- Test 2

</details>

• 2nd ex.:

<details>
    <summary>Test</summary>
<br>
- Test 1
- Test 2
</details>

Expected behavior:

• In the 1st ex:

Test

• Test 1
• Test 2

• In the 2nd ex.:

Test

- Test 1 - Test 2

Actual behavior:

• In the 1st ex. the contents are not considered part of the summary
  

• In the 2nd ex. it's rendered proberly and matched the expected behavior but with that I lose the checklist
  

Versions

• Mark Text: 0.16.1
• Operating system:

Operating System: EndeavourOS 
KDE Plasma Version: 5.18.4
KDE Frameworks Version: 5.68.0
Qt Version: 5.14.2
Kernel Version: 5.6.3-2-clear
OS Type: 64-bit

[fxha]

Thank you for reporting the issue. We noticed that this is a duplicate of #2034. You may want to subscribe there for further updates.