Extra <br data-cke-filler> element added where it is not supposted to be compared to the original content

[Sanderovich]

📝 Provide detailed reproduction steps (if any)

1. Copy the rendered html <p>Hello!</p><br><h1>Heading</h1> or Hello!<br><h1>Heading</h1> into the CKEditor Demo.

✔️ Expected result

Hello!

Heading

❌ Actual result

Extra space between Hello! and Heading.

Hello!


Heading

❓ Possible solution

In the DomConverter viewChildrenToDom it asks for the fillerPositionOfset and the ContainerElement always gives a filler when it ends with a <br>. Near the code is the following comment: // Block filler is required after a
if it's the last element in its container. See #1422. which points me to a irrelvant pull request (#1422), so I can not determine why it was added, but if I remove the related code I get the expected result.

📃 Other details

• Browser: Firefox, Chromium
• OS: Wndow, Linux
• Tested on CKEditor Demo

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