[Cuis-dev] Removed 4 sequences from NamedCharacters / LatEx character input

[Juan Vuletich]

Hi Folks, especially Luciano.

Today I learned that the \ + name + space sequence for entering selected 
Unicode characters meant that some valid Smalltalk could not be entered. 
For instance:
'C:\' [space] (i.e. some reasonable Windows file path in a String 
literal, followed by a space character)
"C:\" [space] (i.e. some reasonable Windows file path in a comment, 
followed by a space character)
a \~ b (i.e. some weird but possible binary selector)
`a copyWith: $\` (i.e. some backtick compile time constant ending with a 
backslash)

If Luciano or anyone thinks they really need this, we can add a preference.

Comments welcome.

Thanks!

-- 
Juan Vuletich
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