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00697: Strange compound conditional behavior

Description:
My experiences with compound conditionals
were quite strange so I wrote some test code:

Compound conditionals

Shouln't all these 6 give One two three?:

One (:if true || false:)two(:if:) three

One two three

One (:if false || true:)two(:if:) three

One three

One (:if [false] || [true]:)two(:if:) three

One two three

One (:if [false] || true:)two(:if:) three

One two three

One (:if false || [true]:)two(:if:) three

One three

One (:if [false || true]:)two(:if:) three

One two three

Nested conditionals

(:if false:)(:if true:)This text should never show(:if:)(:if:)

This text should never show

--hartwork

Some notes on the above:

• Compound conditionals require the use of "expr" or a leading bracket
• Every operator (including brackets) has to be surrounded by spaces

Thus, rewriting the above conditionals:

* One (:if expr true || false:)two(:if:) three
* One (:if expr false || true:)two(:if:) three
* One (:if expr ( false ) || ( true ):)two(:if:) three
* One (:if expr ( false ) || true:)two(:if:) three
* One (:if expr false || ( true ):)two(:if:) three
* One (:if [ false || true ]:)two(:if:) three

• Nested conditionals appeared in recent 2.2beta series and require (:if2 cond:) to be numbered. See ConditionalMarkup for examples.