[jdk21u-dev] RFR: 8317808: HTTP/2 stream cancelImpl may leave subscriber registered [v3]

[Alexey Bakhtin]

> Clean backport of JDK-8317808
> 
> All jtreg tests for java.net.httpclient are passed

Alexey Bakhtin has updated the pull request incrementally with three additional commits since the last revision:

 - Revert "Backport fc98998627443d6e73ac70661f47f48b30525712"
   
   This reverts commit 899abf76e7a381abdfbc30f08a6a5678c0a8065d.
 - Revert "Backport 720b44648bcff997278af92746f942b2425298a5"
   
   This reverts commit a5b7bb4d432c868d598c35f54306e40747071ad7.
 - Revert "Remove extra import"
   
   This reverts commit 480336754274ea62ab2e9b076dcec91f7d483c25.

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

Changes:
  - all: https://git.openjdk.org/jdk21u-dev/pull/1426/files
  - new: https://git.openjdk.org/jdk21u-dev/pull/1426/files/c0f83e97..0857043a

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk21u-dev&pr=1426&range=02
 - incr: https://webrevs.openjdk.org/?repo=jdk21u-dev&pr=1426&range=01-02

  Stats: 1087 lines in 15 files changed: 12 ins; 1009 del; 66 mod
  Patch: https://git.openjdk.org/jdk21u-dev/pull/1426.diff
  Fetch: git fetch https://git.openjdk.org/jdk21u-dev.git pull/1426/head:pull/1426

PR: https://git.openjdk.org/jdk21u-dev/pull/1426