[Fix] : Linebreak insertion breaks format inheritance

[Jynx2004]

Description

Instead of sending value 0 as a static value we take the current format from selection.format and pass it to the respective function responsible for format change.
As a result the format gets passed on between multiple linebreaks.

Closes #8160

Before

After

[vercel]

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Project	Deployment	Actions	Updated (UTC)
lexical	Ready	Preview, Comment	Feb 28, 2026 7:10pm
lexical-playground	Ready	Preview, Comment	Feb 28, 2026 7:10pm

[etrepum]

I will review this after it has new tests to show that the change has the desired behavior

[Jynx2004]

I will review this after it has new tests to show that the change has the desired behavior

` -$updateSelectionFormatStyle(selection, 0, '');
  +$updateSelectionFormatStyle(selection, selection.format, '');`

Here only the passed argument is changed instead of sending static 0 value we have passed the actual format which will not need any new tests . It can be tested on existing tests.

[etrepum]

There needs to be a new test that shows that this change does something useful, and that future changes to lexical preserve that behavior. The existing test suite is not sufficient to show that your code works as expected.

[Jynx2004]

There needs to be a new test that shows that this change does something useful, and that future changes to lexical preserve that behavior. The existing test suite is not sufficient to show that your code works as expected.

Will create some tests for testing this issue.

[Jynx2004]

There needs to be a new test that shows that this change does something useful, and that future changes to lexical preserve that behavior. The existing test suite is not sufficient to show that your code works as expected.

I have added the test case to test this feature

[etrepum]

Based on running the unit tests locally I don't think this works, but the unit test can be written more concisely