RFR: 8368775: Remove outdated comment in OutlineTextRenderer

[Sergey Bylokhov]

On Fri, 26 Sep 2025 11:23:03 GMT, Daniel Gredler <dgredler at openjdk.org> wrote:

> Until [JDK-4138921](https://bugs.openjdk.org/browse/JDK-4138921), `TextLayout` did not accept empty strings in the constructor. This limitation has been removed. However, there is a guard condition in `OutlineTextRenderer` which checks for an empty string before trying to use `TextLayout` which explicitly calls out this limitation in a code comment. We should remove the out-of-date comment but leave the check in as an optimization (see discussion in PR #26947).

src/java.desktop/share/classes/sun/java2d/pipe/OutlineTextRenderer.java line 76:

> 74:     public void drawString(SunGraphics2D g2d, String str, double x, double y) {
> 75: 
> 76:         if (str.length() == 0) {

You can use str.isEmpty() here.

Do we actually call this method with an empty string? I think we have such an optimization at a higher level in SunGraphics2D.

-------------

PR Review Comment: https://git.openjdk.org/jdk/pull/27523#discussion_r2382848523