RFR: 8243545: don't use clip rect in texture-mode (in IsoBlit)

[Artem Bochkarev]

also add logging

fixed:
JDK-8243545 Nimbus L&F - SwingSet2 - Highlighted/Focused button has UI artifact
JDK-8243546 Nimbus L&F - SwingSet2 - Slider Demo - vertical slider is not rendered properly
JDK-8243542 Nimbus L&F - SwingSet2 - Internal Frames Demo - Frame dragging result in some artifacts. Recovers on window
refresh

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Commit messages:
 - 8243545: don't use clip rect in texture-mode (in IsoBlit)

Changes: https://git.openjdk.java.net/lanai/pull/43/files
 Webrev: https://webrevs.openjdk.java.net/lanai/43/webrev.00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8243545
  Stats: 8 lines in 2 files changed: 5 ins; 0 del; 3 mod
  Patch: https://git.openjdk.java.net/lanai/pull/43.diff
  Fetch: git fetch https://git.openjdk.java.net/lanai pull/43/head:pull/43

PR: https://git.openjdk.java.net/lanai/pull/43