Problem running tests against 2026.1 (unresolved reference to ActionGroup)

IntelliJ Platform
1

intellij-platform-gradle-plugin v2.13.1
V1 plugin descriptor
Running tests against 2026.1 rc

Almost all tests are failing now with 2026.1 rc, because of an unresolved ActionGroup ID.
I don’t know how to fix this. The test passes when I remove the reference from plugin.xml, but that’s not what I want to release.

I also don’t know if it’s a packaging problem of the IDE or a problem of the intellij-platform-gradle-plugin.

Basically the error is “ERROR: ActionGroupStub (bashpro.SendSignal): group with id “XDebugger.ToolWindow.LeftToolbar” isn’t registered”.

The action was apparently moved to intellij.platform.debugger.impl.ui.xml in 2026.1.
I already added bundledModule("intellij.platform.debugger.impl") to the build setup, but this did not fix the problem.

My plugin.xml contains thIs, it refers to “XDebugger.ToolWindow.LeftToolbar” to add a new action to the group:

        <group id="bashpro.SendSignal" class="pro.bashsupport.shell.debug.xdebugger.SendSignalActionGroup">
            <add-to-group group-id="XDebugger.ToolWindow.LeftToolbar" anchor="after" relative-to-action="Stop"/>
        </group>

The full error message:

ERROR: com.intellij.openapi.actionSystem.impl.ActionGroupStub (bashpro.SendSignal): group with id "XDebugger.ToolWindow.LeftToolbar" isn't registered so the action won't be added to it; the action can be invoked via "Find Action" (module=PluginMainDescriptor(name=pro.bashsupport, id=pro.bashsupport, version=261.22158.182, isBundled=true, path=~/self-employment/products/bashsupport-pro/build/resources/test)) [Plugin: pro.bashsupport]
com.intellij.diagnostic.PluginException: com.intellij.openapi.actionSystem.impl.ActionGroupStub (bashpro.SendSignal): group with id "XDebugger.ToolWindow.LeftToolbar" isn't registered so the action won't be added to it; the action can be invoked via "Find Action" (module=PluginMainDescriptor(name=pro.bashsupport, id=pro.bashsupport, version=261.22158.182, isBundled=true, path=~/self-employment/products/bashsupport-pro/build/resources/test)) [Plugin: pro.bashsupport]
	at com.intellij.openapi.actionSystem.impl.ActionManagerImplKt.reportActionError(ActionManagerImpl.kt:1723)
	at com.intellij.openapi.actionSystem.impl.ActionManagerImplKt.access$reportActionError(ActionManagerImpl.kt:1)
	at com.intellij.openapi.actionSystem.impl.ActionManagerImpl.getParentGroup(ActionManagerImpl.kt:856)
	at com.intellij.openapi.actionSystem.impl.ActionManagerImpl.processAddToGroupNode(ActionManagerImpl.kt:815)
	at com.intellij.openapi.actionSystem.impl.ActionManagerImpl.processGroupElement(ActionManagerImpl.kt:748)
	at com.intellij.openapi.actionSystem.impl.ActionManagerImpl.registerPluginActions(ActionManagerImpl.kt:432)
	at com.intellij.openapi.actionSystem.impl.ActionManagerImpl.doRegisterActions(ActionManagerImpl.kt:297)
	at com.intellij.openapi.actionSystem.impl.ActionManagerImpl.<init>(ActionManagerImpl.kt:198)
2

I tried moving this to XDebugger.ToolWindow.TopToolbar3.Extra, but same error.

When I try to register the missing group in my test plugin.xml, then the SDK says it’s already registered. This seems like weird packaging or a weird classloader, I guess.

For now, I’m unable to solve this.

5

By any chance, does your plugin use plugin model v2? In this case you probably need intellij.platform.debugger.impl dependency on runtime dependency graph so the platform sorts action initialization properly.

6

Nope, it’s a v1 descriptor. Adding the module for v1 via bundledModule(…)didn’t help. The logs did not show that it wasn’t loaded, but I’m not sure.

7

Filed IJPL-240698 Debugger API: cannot access the action group in 2026.1