RFR: 8367867: [macosx] Ignorable whitespace in text not removed when printing

[Francesco Andreuzzi]

On Wed, 17 Sep 2025 13:28:57 GMT, Daniel Gredler <dgredler at openjdk.org> wrote:

> When text is printed (or drawn to screen), some whitespace characters like new lines should be ignored (see `FontUtilities.isIgnorableWhitespace(int)`). This is currently not being done when printing on macOS, and is one (of about half a dozen) reasons why `java/awt/print/PrinterJob/PrintTextTest.java` is currently problem listed on macOS. Fixing this bug will get us one step closer to removing this test from the problem list.
> 
> Within `PrintTextTest`, this issue can be seen specifically with the extra space before and after "drawChars(" on every page of the printed document. This whitespace should not be present.
> 
> This change aligns behavior with printing on other platforms (see `RasterPrinterJob.removeControlChars(String)`) and with screen display on macOS (see `CCharToGlyphMapper`) and other platforms.

src/java.desktop/share/classes/sun/print/RasterPrinterJob.java line 2479:

> 2477:      * don't have to worry about platform or font specific handling of them.
> 2478:      */
> 2479:     public String removeControlChars(String s) {

Perhaps the commend on this method could be updated too, since the method became `public`?

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PR Review Comment: https://git.openjdk.org/jdk/pull/27345#discussion_r2355673235