8283493: Create an automated regression test for JComboBox.setPrototypeDisplayValue()

[manukumarvs]

Create a regression test for JDK-4231298
Issue:
When a JComboBox first drops down, the renderer is called for
every element in the list, even those elements that will not
actually be drawn on the screen.

Fix:
Introduced new API to JComboBox: get/setPrototypeDisplayValue(). This API allows the UI to calculate the display size using this prototype value rather than iterated over a large list of items. See RFE 4289100 which also addresses this problem.

Testing:

1. Tested in Mach5, 10 times per platform(macos,linux and windows) and got all pass.

2. Tested in JDK 1.3.0 and JDK 1.4.0 and the results are given below.
   Java 1.3.0 -> Test Failed.
   $ jdk1.3/bin/java JComboBoxPrototypeTest
   getListCellRendererComponent index = -1, isSelected = false, cellHasFocus = false
   Value of the Counter is 1
   ....
   getListCellRendererComponent index = -1, isSelected = false, cellHasFocus = false
   Value of the Counter is 101
   Test Failed
   java.lang.RuntimeException: Custom Renderer got called 101 times, expected is maximum 6 times
   at JComboBoxPrototypeTestOld.main(JComboBoxPrototypeTest.java:107)

Java 1.4.0(added a call to setPrototypeDisplayValue()) -> Test Passed.
$ j2sdk1.4.0/bin/java JComboBoxPrototypeTest
getListCellRendererComponent index = -1, isSelected = false, cellHasFocus = false
Value of the Counter is 1
getListCellRendererComponent index = -1, isSelected = false, cellHasFocus = false
Value of the Counter is 2
getListCellRendererComponent index = -1, isSelected = false, cellHasFocus = false
Value of the Counter is 3
Test Passed

---

Progress

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Issue

• JDK-8283493: Create an automated regression test for RFE 4231298

Reviewers

• Sergey Bylokhov (@mrserb - Reviewer)

Reviewing

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Checkout this PR locally:
$ git fetch https://git.openjdk.java.net/jdk pull/7905/head:pull/7905
$ git checkout pull/7905

Update a local copy of the PR:
$ git checkout pull/7905
$ git pull https://git.openjdk.java.net/jdk pull/7905/head

Using Skara CLI tools

Checkout this PR locally:
$ git pr checkout 7905

View PR using the GUI difftool:
$ git pr show -t 7905

Using diff file

Download this PR as a diff file:
https://git.openjdk.java.net/jdk/pull/7905.diff

[bridgekeeper]

👋 Welcome back mvs! A progress list of the required criteria for merging this PR into master will be added to the body of your pull request. There are additional pull request commands available for use with this pull request.

[openjdk]

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[mlbridge]

Webrevs

• 01: Full - Incremental (ce0e62e9)
• 00: Full (2d5c9fb8)

[openjdk]

@manukumarvs This change now passes all automated pre-integration checks.

ℹ️ This project also has non-automated pre-integration requirements. Please see the file CONTRIBUTING.md for details.

After integration, the commit message for the final commit will be:

8283493: Create an automated regression test for RFE 4231298

Reviewed-by: serb

You can use pull request commands such as /summary, /contributor and /issue to adjust it as needed.

At the time when this comment was updated there had been 372 new commits pushed to the master branch:

• 6ea996c: 8282422: JTable.print() failed with UnsupportedCharsetException on AIX ko_KR locale
• 8cc1235: 8282952: Thread::exit should be immune to Thread.stop
• 33eb89d: 8283457: [macos] libpng build failures with Xcode13.3
• f7d21c3: 8283480: Make AbstractStringBuilder sealed
• d29c7e7: 8282590: C2: assert(addp->is_AddP() && addp->outcnt() > 0) failed: Don't process dead nodes
• 557ff4b: 8282625: Formatter caches Locale/DecimalFormatSymbols poorly
• fabde3b: 8283451: C2: assert(_base == Long) failed: Not a Long
• c0f984e: 8283456: Make CompiledICHolder::live_count/live_not_claimed_count debug only
• 85628a8: 8282592: C2: assert(false) failed: graph should be schedulable
• a6fd0b2: 8283087: Create a test or JDK-4715503
• ... and 362 more: https://git.openjdk.java.net/jdk/compare/f07b8165231799383303e5c0755d07afd2feb7fd...master

As there are no conflicts, your changes will automatically be rebased on top of these commits when integrating. If you prefer to avoid this automatic rebasing, please check the documentation for the /integrate command for further details.

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[manukumarvs]

/integrate

[openjdk]

@manukumarvs
Your change (at version ce0e62e) is now ready to be sponsored by a Committer.

[prrace]

/sponsor

[openjdk]

Going to push as commit 6917c39.
Since your change was applied there have been 392 commits pushed to the master branch:

• 0ee65e1: 8283465: Character.UnicodeBlock.NUM_ENTITIES is out of date
• f9137cb: 8280896: java/nio/file/Files/probeContentType/Basic.java fails on Windows 11
• 0b11b57: 8283222: improve diagnosability of runtime/8176717/TestInheritFD.java timeouts
• 138460c: 8163327: Remove 3DES from the default enabled cipher suites list
• f017739: 8282241: Invalid generic signature for redefined classes
• 3e73a0b: 8283237: CallSite should be a sealed class
• a771600: 8283279: [Testbug] Improve TestGetSwapSpaceSize
• 2b291d8: 8282536: java.net.InetAddress should be a sealed class
• dc45b0a: 8283513: Parallel: Skip the card marking in PSRootsClosure
• 78ef2fd: 8283562: JDK-8282306 breaks gtests on zero
• ... and 382 more: https://git.openjdk.java.net/jdk/compare/f07b8165231799383303e5c0755d07afd2feb7fd...master

Your commit was automatically rebased without conflicts.

[openjdk]

@prrace @manukumarvs Pushed as commit 6917c39.

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