8280994: [XWayland] Drag and Drop does not work in java -> wayland app direction

[azvegint]

This change resolves the issue that drag and drop from a Java application to a native Wayland application (such as gedit) is not possible on Linux.

Our code it quite picky for the drop target, and requires it to be a top level window with the WM_STATE property set, whereas the XWayland server provides dummy windows without this property.
So now we make an exclusion for this case.

After the fix it successfully passes previously failed related manual jtreg/conformance tests on Wayland.
Other tests are also passed.

---

Progress

• Change must be properly reviewed (1 review required, with at least 1 Reviewer)
• Change must not contain extraneous whitespace
• Commit message must refer to an issue

Issue

• JDK-8280994: [XWayland] Drag and Drop does not work in java -> wayland app direction

Reviewers

• Phil Race (@prrace - Reviewer) ⚠️ Review applies to ec4493f5
• Prasanta Sadhukhan (@prsadhuk - Reviewer)

Reviewing

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Checkout this PR locally:
$ git fetch https://git.openjdk.org/jdk.git pull/14266/head:pull/14266
$ git checkout pull/14266

Update a local copy of the PR:
$ git checkout pull/14266
$ git pull https://git.openjdk.org/jdk.git pull/14266/head

Using Skara CLI tools

Checkout this PR locally:
$ git pr checkout 14266

View PR using the GUI difftool:
$ git pr show -t 14266

Using diff file

Download this PR as a diff file:
https://git.openjdk.org/jdk/pull/14266.diff

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• 03: Full - Incremental (5c890574)
• 02: Full - Incremental (c0b43f19)
• 01: Full - Incremental (ec4493f5)
• 00: Full (b9079d41)

[openjdk]

@azvegint 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:

8280994: [XWayland] Drag and Drop does not work in java -> wayland app direction

Reviewed-by: prr, psadhukhan

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At the time when this comment was updated there had been 45 new commits pushed to the master branch:

• 6d511f1: 8309129: AArch64: guarantee(T != T2S) failed: "incorrect arrangement" after JDK-8307795
• 9be5769: 8291966: SwitchBootstrap.typeSwitch could be faster
• db0857d: 8306578: Report error if no label given in @see and {@link} when no default is available
• 8c9d21e: 8296920: Regression Test DialogOrient.java fails on MacOS
• ac41c03: 8303465: KeyStore of type KeychainStore, provider Apple does not show all trusted certificates
• 11fb5b2: 8309104: [JVMCI] compiler/unsafe/UnsafeGetStableArrayElement test asserts wrong values with Graal
• a02d800: 8309405: RISC-V: is_deopt may produce unaligned memory read
• 3fa776d: 8302673: [SuperWord] MaxReduction and MinReduction should vectorize for int
• 22a9a86: 8309268: C2: "assert(in_bb(n)) failed: must be" after JDK-8306302
• b6c9232: 8305225: A service broken error despite annotation processor generating it if directives listed
• ... and 35 more: https://git.openjdk.org/jdk/compare/050425b141d710659928020dd89f94ed46c056a6...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.

➡️ To integrate this PR with the above commit message to the master branch, type /integrate in a new comment.

[azvegint]

/integrate

[openjdk]

Going to push as commit 73352b6.
Since your change was applied there have been 47 commits pushed to the master branch:

• 5cd8af7: 8308726: RISC-V: avoid unnecessary slli in the vectorized arraycopy stubs for bytes
• 80232b7: 8308969: make test-prebuilt doesn't return the correct exit code
• 6d511f1: 8309129: AArch64: guarantee(T != T2S) failed: "incorrect arrangement" after JDK-8307795
• 9be5769: 8291966: SwitchBootstrap.typeSwitch could be faster
• db0857d: 8306578: Report error if no label given in @see and {@link} when no default is available
• 8c9d21e: 8296920: Regression Test DialogOrient.java fails on MacOS
• ac41c03: 8303465: KeyStore of type KeychainStore, provider Apple does not show all trusted certificates
• 11fb5b2: 8309104: [JVMCI] compiler/unsafe/UnsafeGetStableArrayElement test asserts wrong values with Graal
• a02d800: 8309405: RISC-V: is_deopt may produce unaligned memory read
• 3fa776d: 8302673: [SuperWord] MaxReduction and MinReduction should vectorize for int
• ... and 37 more: https://git.openjdk.org/jdk/compare/050425b141d710659928020dd89f94ed46c056a6...master

Your commit was automatically rebased without conflicts.

[openjdk]

@azvegint Pushed as commit 73352b6.

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