RFR: Merge jdk:master [v2]

Tue Nov 10 00:08:29 UTC 2020

> Manual merge of `jdk/master` into `lanai/master` since the nightly auto-merge process is _still_ offline (see [SKARA-764](https://bugs.openjdk.java.net/browse/SKARA-764)).

Kevin Rushforth has updated the pull request with a new target base due to a merge or a rebase. The pull request now contains 913 commits:

 - Merge remote-tracking branch 'jdk/master' into merge-jdk-2020-11-09
 - 8251033: Background texture is not visible when Alpha Composite is enabled
 - 8238533: [Lanai] Support texture paint where source is transparent
 - 8248129: Swingmark numbers are not good for Nimbus LAF
   8255212: J2DDemo : Rectangle in Texture paint disappears if we enable AA
 - Merge jdk:master
 - Merge jdk:master
 - 8255149: Lanai: DrawImage/IncorrectAlphaConversionBicubic.java failure
 - 8244718: J2DDemo - AlphaComposite tab - output colors are different with AA & non-AA
 - Merge jdk:master
 - 8254881: Commit commandbuffer after draw happens through JNI
 - ... and 903 more: https://git.openjdk.java.net/lanai/compare/17f04fc9...0423c2ee

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Changes: https://git.openjdk.java.net/lanai/pull/127/files
 Webrev: https://webrevs.openjdk.java.net/?repo=lanai&pr=127&range=01
  Stats: 18284 lines in 92 files changed: 18190 ins; 21 del; 73 mod
  Patch: https://git.openjdk.java.net/lanai/pull/127.diff
  Fetch: git fetch https://git.openjdk.java.net/lanai pull/127/head:pull/127

PR: https://git.openjdk.java.net/lanai/pull/127