INRIA / spoon / #18513

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Fix class modificator dissapear (#6849)

When a type is annotated with an annotation whose argument contains a class literal (e.g. @EnableAutoConfiguration(exclude = {String.class})), the sniper printer could drop the 'class' keyword of the type declaration during a relocation/mutation pass, producing non-compilable output ("@X class Foo" -> "@X Foo").

AbstractSourceFragmentContextCollection.knowsHowToPrint matched a KEYWORD token against child fragments with a loose substring 'contains' check. The 'String.class' fragment source contains the substring "class", so a muted annotation collection context wrongly claimed the following type's 'class' keyword and the sniper silently dropped it. Replace the substring match with a token-boundary match (containsKeywordToken) that only accepts 'class' as a standalone keyword and not as a '.class' / qualified-name suffix. Adds a sniper regression test.

fix #6848

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