Closes #4605

js-yaml doesn't always provide line/mark data for certain exceptions;
handle this scenario more gracefully

Closes #4600

Issue #4575

Issue #4575

Issue #4575

Issue #4575

Issue #4559

Issue #4559

Issue #4572

Issue #4572

Closes #4549

Issue #4537

To forbid using the comment strings from their inner modes

Closes #4562

Issue #4560

Issue #4556

Closes #4554

Closes #4548

Closes #4526

Issue #4492

Since showing it next to an empty chunk looks bad

Issue #4492

Issue #4485

Issue #4485

Closes #4478

It sometimes produces invalid output.

Closes #4410

Issue #4413

Adds an option to keep the active line highlighted even when text
inside the line is selected.

So that their vertical offsets actually match the position of the
corresponding lines.

Issue #4364

And use it in the merge addon to get the proper offsets for merge buttons

Issue #4364

Issue #4353

Issue #4353

Closes #4353