I know que and a vowel is qu' but does the same rule apply to qui?
No, qui doesn’t elide or undergo contraction. Formal elision almost exclusively involves a terminal “e”, although the case of “si” is an obvious exception, and some fixed elisions. Standard elisions are required in speech and in writing.
Informal “elisions” (gliding is a term used for this) such t’as for "tu as" are used frequently in speech, and informal writing only.
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