8262446: DragAndDrop hangs on Windows

[dmarkov20]

The IME functions and the DND operation must be executed on the toolkit thread. If the DND operation is in progress, the IME API is invoked via SendMessage() call inside InvokeInputMethodFunction() to avoid a hang. The flag isInDoDragDropLoop indicates whether the DND takes place or not. The flag works properly if the DND is performed between two Java windows. However if anything is dragged from native app, (e.g. Windows FileExplorer) to Java the flag is NOT set. That’s the root cause of the hang.

Fix:
Introduce a new flag to indicate DND operation between Java and native app.

Testing:
mach5 green

---

Progress

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Issue

• JDK-8262446: DragAndDrop hangs on Windows

Reviewers

• Alexey Ivanov (@aivanov-jdk - Reviewer) ⚠️ Review applies to dbc9dac
• Sergey Bylokhov (@mrserb - Reviewer) ⚠️ Review applies to dbc9dac
• Alexander Zuev (@azuev-java - Reviewer) ⚠️ Review applies to dbc9dac

Download

$ git fetch https://git.openjdk.java.net/jdk pull/2825/head:pull/2825
$ git checkout pull/2825

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• 03: Full - Incremental (3810f1b)
• 02: Full - Incremental (dbc9dac)
• 01: Full - Incremental (d9af987)
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[openjdk]

@dmarkov20 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:

8262446: DragAndDrop hangs on Windows

Reviewed-by: aivanov, serb, kizune

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At the time when this comment was updated there had been 31 new commits pushed to the master branch:

• 5eb2091: 8261689: javax/swing/JComponent/7154030/bug7154030.java still fails with "Exception: Failed to hide opaque button"
• 75a5be8: 8263054: [testbug] SharedArchiveConsistency.java reuses jsa files
• 2afbd5d: 8250804: Can't set the application icon image for Unity WM on Linux.
• fa43f92: 8261845: File permissions of packages built by jpackage
• 23ee60d: 8261008: Optimize Xor
• e1cad97: 8262862: Harden tests sun/security/x509/URICertStore/ExtensionsWithLDAP.java and krb5/canonicalize/Test.java
• 2c0507e: 8261812: C2 compilation fails with assert(!had_error) failed: bad dominance
• 9755782: 8157682: @inheritdoc doesn't work with @exception
• 8c13d26: 8263050: move HtmlDocletWriter.verticalSeparator to IndexWriter
• 8d3de4b: 8262844: (fs) FileStore.supportsFileAttributeView might return false negative in case of ext3
• ... and 21 more: https://git.openjdk.java.net/jdk/compare/22513199e5107692ab52f89e9646e468abc34353...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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[mrserb]

Why we cannot reuse the old flag? "isInDoDragDropLoop"? I think the Robot.waitForIdle() will hang if isInDoDragDropLoop is not set to true while dragging something from the native app.

[takiguc]

@dmarkov20
I'd like to confirm this issue was not fixed by JDK-8261231 #2448 ?

[dmarkov20]

Why we cannot reuse the old flag? "isInDoDragDropLoop"? I think the Robot.waitForIdle() will hang if isInDoDragDropLoop is not set to true while dragging something from the native app.

Initially I didn’t want to touch that flag but after a closer look to “isInDoDragDropLoop” I think it is OK to reuse the flag. I will update PR shortly.

[dmarkov20]

@dmarkov20
I'd like to confirm this issue was not fixed by JDK-8261231 #2448 ?

That's right. This one and JDK-8261231 are two different issues. It is expected that the changes for JDK-8261231 do not fix this.

[dmarkov20]

I have update the fix: reuse isInDoDragDropLoop flag instead of introducing a new one.
@mrserb @aivanov-jdk
Could you take a look, please?

[takiguc]

@dmarkov20
Sorry I'm not reviewer.
It seems Copyright year is not changed. Is it OK ?

[dmarkov20]

@dmarkov20
Sorry I'm not reviewer.
It seems Copyright year is not changed. Is it OK ?

I have updated the copyright

[dmarkov20]

/integrate

[openjdk]

@dmarkov20 Since your change was applied there have been 44 commits pushed to the master branch:

• b1cc864: 8251210: Link JDK api docs to other versions
• 0da889e: 8210100: ParallelGC should use parallel WeakProcessor
• 679faa6: 8263097: Update JMH devkit to 1.28
• ab2cfcc: 8252831: Correct "no comment" warnings in jdk.net module
• 51cca57: 8259577: Dangling reference to temp_path in Java_sun_tools_attach_VirtualMachineImpl_getTempDir
• a0c3f24: 8263091: Remove CharacterData.isOtherUppercase/-Lowercase
• 13625be: 8263090: Avoid reading volatile fields twice in Locale.getDefault(Category)
• 61cff4d: 8257913: Add more known library locations to simplify Linux cross-compilation
• 22a3117: 8263137: Typos in sun.security.ssl.RenegoInfoExtension
• 18fc350: 8259886: Improve SSL session cache performance and scalability
• ... and 34 more: https://git.openjdk.java.net/jdk/compare/22513199e5107692ab52f89e9646e468abc34353...master

Your commit was automatically rebased without conflicts.

Pushed as commit bf9b74d.

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