> On 12.08.2019, at 13:52, commits at source.squeak.org wrote:
> 
> A new version of Collections was added to project The Inbox:
> http://source.squeak.org/inbox/Collections-ct.848.mcz
> 
> ==================== Summary ====================
> 
> Name: Collections-ct.848
> Author: ct
> Time: 12 August 2019, 1:52:05.273463 pm
> UUID: a43047b1-7885-fa49-bfe0-f5bd175d66e4
> Ancestors: Collections-fn.847
> 
> Add visibility test for Characters

To be precise, whether these characters are invisible depends on the Font used…


> 
> Thanks to jrm for the hint!
> 
> =============== Diff against Collections-fn.847 ===============
> 
> Item was added:
> + ----- Method: Character>>isInvisible (in category 'testing') -----
> + isInvisible
> + 
> + 	^ (self > 31 or: [#(9 10 13) includes: self asciiValue]) not!
> 
>