RFR: 8138614: (spec str) StringBuffer and StringBuilder methods improperly require "new" String to be returned

[Chen Liang]

On Wed, 12 Feb 2025 19:55:29 GMT, Stuart Marks <smarks at openjdk.org> wrote:

> A couple adjustments to the specs for four methods of StringBuilder and StringBuffer so that they no longer require new Strings to be created, just a String with the right contents. No implementation changes. Note that the actual specs (and implementations) are actually in AbstractStringBuilder, and they're inherited by StringBuilder and StringBuffer.

Marked as reviewed by liach (Reviewer).

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PR Review: https://git.openjdk.org/jdk/pull/23599#pullrequestreview-2616094752