Continuing the discussion from Pasted URLs in Rich Text Editor improperly escape tilde character:
Reproducing:
I entered the following URL above by pasting it in the editor:
https://frinklang.org/fsp/solve2.fsp?equations=a+%3D+3+b+%2B+c&solveFor=&f=&ev=on&sel_a=S&val_a=&sel_b=S&val_b=&sel_c=L&val_c=299792458+m+s%5E-1&resultAs=
Proper response to clicking on the link would be:
But the Discourse-Rendered version of that URL is:
https://frinklang.org/fsp/solve2.fsp?equations=a%2B%3D%2B3%2Bb%2B%2B%2Bc&solveFor=&f=&ev=on&sel_a=S&val_a=&sel_b=S&val_b=&sel_c=L&val_c=299792458%2Bm%2Bs%5E-1&resultAs=
Note the %2B replacing the + character. This fails, and produces the following result:
Testing hyperlink tool:
Discourse Link Tool-Rendered URL:
https://frinklang.org/fsp/solve2.fsp?equations=a%2B%3D%2B3%2Bb%2B%2B%2Bc&solveFor=&f=&ev=on&sel_a=S&val_a=&sel_b=S&val_b=&sel_c=L&val_c=299792458%2Bm%2Bs%5E-1&resultAs=
This also fails, looking like this:
I’m not 100% sure what’s going wrong, but I think it’s the + characters, which should be spaces, being mis-processed into a literal +.
Using a + for a space in a URL is standards-compliant for HTML form encoding, so this is possibly affecting other sites/systems that use the + character this way.
See: WHATWG. HTML Living Standard. Section “URL-encoded form data”. HTML Standard