Code Editor: If condition expand/collapse doesn't work if "&" operator is used

Version Information (please complete the following information):

• 3.4, 3.5

Describe the bug

If a IF condition contains multiple tests with & operator then the IF is not recognized for automitic expand/collapse regionalization and is always expanded.

To Reproduce

Steps to reproduce the behavior:

1. Create IF condition with only a single value test. Expand/collapse works
2. Add additional test to the IF. Expand/collapse no longer works

added arc bug labels

added process-editor label

changed milestone to %4.6.1

assigned to @hwithington

This is fixed.

The parser was erroneously detecting the code as a single-line IF in the form

IF(condition, true, false); 

This was due, not to the & as suspected, but to the two commas in the nested function call. Hence, a statement like below would detect as an inline-IF:

IF(x @= FUNCTION(1,2,3));

I updated the regular expression to tolerate a number of nested function calls.

For example, the following will not detect as a single-line IF and now folds correctly:

IF( vOne @= '1' & ElementIndex( '1', '2', STRINGTONUMBER(ATTRS('dim', 'el', 'att')  ) ) > 1);

A user can still break it by nesting many function calls, but this is limitation in the Javascript regex system -- it doesn't support balanced tokens or recursion.

It's not perfect, but it's good enough for normal usage.

changed milestone to %review

added fixed label

This has been merged into develop branch.

changed milestone to %4.6.1