RFR: 8272392 Lanai: SwingSet2. Black background on expanding tree node [v2]

[Alexey Ushakov]

> Removed creation of the separate encoder depending on destination properties as we don't use this info to customize the encoder properties

Alexey Ushakov has updated the pull request incrementally with one additional commit since the last revision:

  8272392 Lanai: SwingSet2. Black background on expanding tree node
  
  Fixed incorrect addition of the values into pipeline state cache. Refactored index initialization. Removed unused flags from MTLClip.

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

Changes:
  - all: https://git.openjdk.java.net/jdk/pull/6529/files
  - new: https://git.openjdk.java.net/jdk/pull/6529/files/1d4cf5c6..89138dfa

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=6529&range=01
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=6529&range=00-01

  Stats: 37 lines in 2 files changed: 4 ins; 14 del; 19 mod
  Patch: https://git.openjdk.java.net/jdk/pull/6529.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/6529/head:pull/6529

PR: https://git.openjdk.java.net/jdk/pull/6529