I routinely work with documents, that contain plenty of parts, where spell-checking is not appropriate. The most obvious example would be code snippets and quotes from Emails with typos, but also e.g. titles of referenced bug tickets.
For those parts, having automatic spell checking enabled leads to constant visual noise, that I want to avoid, while maintaining the on-the-fly checking of text I am writing.
Partly, the issue can be solved by setting the language to “none” for paragraph and character styles. But in some cases, this would be inappropriate or lead to follow-up issues (e.g. using the “Source Text” character style changing the font size in headings).
As an alternative, I was wondering if it is possible to show the spell-check markers only for the paragraph I am currently editing – instant feedback as before, but only for the part where I currently need it.