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Can't edit a question just to add tags.
One can apparently not make an edit to a post just to change the tags. There is a message that nothing was changed because I didn't edit the post. Well, I didn't edit the body of the post, just the tags.
This makes it impossible to add/correct tags to otherwise perfectly fine questions, so I believe it should be regarded as a bug.
Specifically, I did this, and can reproduce it every time:
I wanted to edit this question on Software Development.
Add 4 tags, some are probably not yet created.
I type in these tags with space in between:
C++ static thread_local dynamic-initialization static-storage-duration
thread_localare language keywords, dynamic initialization is a formal C++ term and static storage duration is a common formal term in C and C++ both.)
The site refuses the edit with the message "No changes were saved because you didn't edit the post."
Perhaps it is related to tag naming or by adding tags that don't exist?