Yann Cebron

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IDEA-231419 is about the target platform chosen to compile against, not the IDE version used to build the plugin. Choosing 2019.3 as target platform version should allow running it in 2020.1 and fo...

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2. IntelliJ IDEA Open API and Plugin Development
3. Request to clarify API backward compatibility policy

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Indeed this is not permitted, see https://www.jetbrains.org/intellij/sdk/docs/reference_guide/api_notable/api_notable_list_2020.html "ResolveCache using IdempotenceChecker in tests". Linked javadoc...

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3. Idempotency errors under 2020.1

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https://youtrack.jetbrains.com/issue/IDEA-232880

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2. IntelliJ IDEA Open API and Plugin Development
3. PicoContainer exceptions when using 2020.1

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https://www.jetbrains.org/intellij/sdk/docs/basics/psi_cookbook.html#how-do-i-find-where-a-particular-psi-element-is-used

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2. IntelliJ IDEA Open API and Plugin Development
3. Kotlin / Intellij Plugin / Refactoring

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See com.jetbrains.python.codeInsight.stdlib.PyStdlibClassMembersProvider#getMembers as a sample implementation.

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2. IntelliJ IDEA Open API and Plugin Development
3. Implementing dynamic object code completion (Python)

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Sorry, I'm not aware of any workaround for above linked issue.  

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2. IntelliJ IDEA Open API and Plugin Development
3. Building intellij from source - ant build fails on 193.6494.9 and 201.4865.12

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It has always been possible to use a newer IDE version when targeting an older platform in your plugin project. IDEA-230489  is a bug and will be fixed, so it will work in 201 again.

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2. IntelliJ IDEA Open API and Plugin Development
3. Request to clarify API backward compatibility policy

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Yes, also employ @Stubbed for <import> tag to avoid building PSI while walking all files/imports. I'd try to avoid building an index first and see if using DOM/stubbed DOM is fast enough.

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3. Search for Java class referenced in specific xml files

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I assume Messages.showMessageDialog() must be delegated to EDT to work, https://www.jetbrains.org/intellij/sdk/docs/basics/architectural_overview/general_threading_rules.html

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3. Plugin to extract runtime exceptions and errors from “Run” window

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Could you please provide a minimal sample to reproduce your setup? Thanks

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3. Prepare All Plugin Modules For Deployment does no add module classes

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