Remove redundant semicolons (top level, class/enum bodies, statements) #156

Upstream: google/google-java-format#1491
Kind: idea | Priority: low

google-java-format#1491 (merged 2026-10-22, copybara export) extends the --cleanup AST pass from google-java-format#1492 so that stray ; are deleted at top level, in class and enum bodies, and as empty statements in blocks. Upstream also moves several existing goldens (for example the semicolon-in-class case) into a "changed by cleanup" set.

Why it matters: our formatter keeps these semicolons, e.g. our golden SemicolonInClass still outputs a lone ; inside the class. It is a harmless tidy-up with a small footprint, but like brace insertion it is a non-whitespace rewrite and should only come with an opt-out.

Examples: not available - the diff shows only the removal of the ;, not the resulting layout of the emptied body in our formatter; our current output keeps the lone ; as in the golden above.

Affected files in our repo:

• open-java-format/src/main/java/com/palantir/javaformat/java/JavaInputAstVisitor.java (visitEmptyStatement, class body member handling)
• open-java-format/src/test/resources/com/palantir/javaformat/java/testdata/SemicolonInClass.input and .output

Suggested action: watch / adopt-the-idea together with the brace-insertion ticket; low priority on its own.

Filed from an upstream-watch ticket after manual review.