What's broken?

In a read-only editor (editable: false), clicking an inline math equation opens its source popup (the LaTeX source and the "OK" button), although the preview click handler and open()/close() are already guarded by editor.isEditable.

The popup of inline content is open exactly while the selection is inside its source (isOpen: isSelected). SourceInlineContentWithPreviewExtension sets selected from onSelectionChange without checking editor.isEditable, and ProseMirror still moves the selection on click when the editor is not editable.

• extension, onSelectionChange
• hook, isOpen: isSelected

What did you expect to happen?

Nothing opens: the rendered equation stays as is and its source is not exposed.

Steps to reproduce

1. Render an editor with editable: false and a document containing an inline math equation.
2. Click the equation.

Suggested fix

Ignore the selection when the editor is not editable, either in the extension (selected: undefined when !editor.isEditable) or in the hook (isOpen: isSelected && editor.isEditable).

BlockNote version

Checked in the source of v0.56.0 and v0.57.0 (same code). Reproduced on 0.56.0.

Additional context

Reported downstream in Docs: suitenumerique/docs#2894
We work around it with CSS for now: .bn-editor:not([contenteditable='true']) .bn-source-block-popup { display: none; }