Two-dimensional expression input in the help text

Questions
1

I wrote the following custom command:

SetEqualQ//ClearAll;
SetEqualQ::usage =
"SetEqualQ[Subscript[list, 1],Subscript[list, 2]]
	yields True if Subscript[list, 1] is a equal to Subscript[list, 2], and False otherwise.";

SetEqualQ[l1_List,l2_List]:=SubsetQ[l1,l2] && SubsetQ[l2,l1];

When I run ?SetEqualQ, the following information will appear:

Selection_145.png
Selection_145.png825×201 16.2 KB

As you can see, the Subscript symbol is not formatted here. I further tried the following method, but still failed:

SetEqualQ//ClearAll;
SetEqualQ::usage =
StringForm["SetEqualQ[`1`, `2`]
	yields True if `1` is a equal to `2`, \
and False otherwise.", Subscript[list, 1],Subscript[list, 2]];
SetEqualQ[l1_List,l2_List]:=SubsetQ[l1,l2] && SubsetQ[l2,l1];

MessageName::messg: SetEqualQ::usage cannot be set to SetEqualQ[Subscript[list, 1], Subscript[list, 2]]
	yields True if Subscript[list, 1] is a equal to Subscript[list, 2], and False otherwise.. It must be set to a string.

Any hints for achieving this gold?

Regards,
Zhao

2

Enter the subscript by pressing Ctrl and - at the same time. See this.

Zhaosubscipt.png
Zhaosubscipt.png588×242 7.54 KB

3

I tried this approach, but when I re-open the Wolfram script file, it will look like this:

SetEqualQ//ClearAll;
SetEqualQ::usage="SetEqualQ[\!\(\*SubscriptBox[\(list\), \(1\)]\),\!\(\*SubscriptBox[\(list\), \(2\)]\)]
    yields True if \!\(\*SubscriptBox[\(list\), \(1\)]\) is equal to \!\(\*SubscriptBox[\(list\), \(2\)]\), and False otherwise.";
SetEqualQ[l1_List,l2_List]:=SubsetQ[l1,l2] && SubsetQ[l2,l1];

As you can see, it is messy and difficult to read and understand.

4

Yes, I experience the same. Also with simple formatting such as italics. If one wants to edit the formatted parts one has to type in the whole new text.

As an aid during editing one can evaluate the following to get a readable version of the existing text:

Information[SetEqualQ, "Usage"]
5

In any case, this is not a WYSIWYG approach, and there seems to be no better way than this.