Allow <s>, <del>, and <ins> in entry subjects.

[pauamma]

Title:
Allow <s>, <del>, and <ins> in entry subjects.

Area:
entries, HTML cleaner

Summary:
Currently, the HTML cleaner removes those, and thus prevents having a subject like "<del>I think I did a bad thing</del> <ins>Oh wait, I misread</ins> when you only discover your misreading after initially posting the entry and want to reflect that in the subject.

Description:
I'm not sure what the original reason for not allowing those was, so there may be reasons why this is infeasible or undesirable. Also, the window title (HTML <title> tag) doesn't allow HTML IIRC, so that would need to be addressed, perhaps by escaping the tags instead of rendering them. (But then, that needs to happen for tags already allowed in subjects, so it wouldn't create a new problem.)

Poll #8405 Allow <s>, <del>, and <ins> in entry subjects.

Open to: Registered Users, detailed results viewable to: All, participants: 51

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This suggestion:

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Should be implemented as-is.
20 (39.2%)

Should be implemented with changes. (please comment)
4 (7.8%)

Shouldn't be implemented.
9 (17.6%)

(I have no opinion)
18 (35.3%)

(Other: please comment)
0 (0.0%)