If $wgSpamRegex is triggered, be sure to return the editing contents
to the user in a box that he can keep on editing.
Don't just expect him to know or be told to hit the BACK key, or
expect BACK will always work in such situations. (Otherwise even when
just previewing an edit, one could just tell the user "This is a
preview. To continue editing just hit BACK.")

Anyway, we are not finished editing. We need to alter what was seen as
a spam word. But instead our hard work is thrown away and we get a
spam warning with no box with our content to continue our editing.
Also the user thinks "You didn't warn me when I hit Preview. Now you
spitefully threw away my work when I hit Save, with no edit box to
continue my hard work."

Version: 1.17.x
Severity: major