Baseline management missing from CPText

[enquora]

Although the constants CPBaselineOffsetAttributeName and CPSuperscriptAttributeName are both defined, it is not currently possible to implement baseline offsets.
This is necessary for both super/subscripts and aligning multiple columns of text, possibly in different fonts or sizes.

It is possible to use unicode characters for super and subscripting numbers but this may compromise searching for strings using the standard numbers rather than their super/subscript equivalents. It is also dependent on fonts implementing the full unicode character set (although this seems now to be a less frequent problem).

What is not possible using unicode is super/subscripting characters (e.g. 3^rd).
This change probably falls into the important-not-urgent class - something for the next major release.

[cappbot]

Milestone: Someday. Label: #new. What's next? A reviewer should examine this issue.

[daboe01]

-#new
+TextView
+#accepted
+#needs-patch

[cappbot]

Milestone: Someday. Labels: #accepted, #needs-patch, TextView. What's next? This issue needs a volunteer to write and submit code to address it.

[daboe01]

a starting point is here: #2883