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Test file writing for multiple image file formats

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issue #2170.

Wrong png output using Color4b when alpha channel not 2^8-1

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 I was writing experimental unit tests for png as suggested by @oktomus because Color4b(50, 100, 150, 42) does not work. ``` TEST_CASE(WritePNG_CorrectlyWritesImagePixels_blue_full) const Color4b fill_color(0,...

This PR solves #4012; any suggestion is appreciated!

Filter out block comment in filter_normal_code if configured to use rustfmt 2 (#4668)

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Back-port the fix (#4720) to rustfmt 1.x; In order to version-gate in `LineClasses`, several function signature had been changed: * `wrap_str` * `filter_normal_code` Should we add the idempotent test cases...

Keep the comment after where clause that has no predicate (#4649)

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The pull request aims at solving #4649, and formats the comment that occurs before the where-clause; two cases are handled by the modified code: * `where` exists but does not...