Some UI Tests Leak thousends Resources without any warning

[jukzi]

Can be locally reproduced by running ImportExistingProjectsWizardTest. The test passes locally but the windows user object climbes to 3000 while they should fall back to <1000 after each test case.
When i pause the UiTestSuite at that time the SWT Spy can be openend and shows a lot leaked shells:

Forcing a GC does NOT show any nondisposed warnings.

I hit onto that issues when SWTError: No more handles was logged in
https://download.eclipse.org/eclipse/downloads/drops4/I20241006-1800/testresults/consolelogs/ep434I-unit-win32-java17_win32.win32.x86_64_17_consolelog.txt

     [java] Shells: 
     [java]   invisible: Shell {Preferences} [layout=GridLayout {numColumns=5 verticalSpacing=5}]
     [java]   invisible: Shell {Import} [layout=GridLayout {numColumns=5 verticalSpacing=5}]
     [java]   invisible: Shell {Import} [layout=GridLayout {numColumns=5 verticalSpacing=5}]
     [java]   invisible: Shell {Dialog Verification} [layout=GridLayout {numColumns=5 verticalSpacing=5}]
     [java]   invisible: Shell {PartRenderingEngine's limbo} [layout=null]
     [java]   invisible: Shell {Dialog Verification} [layout=GridLayout {numColumns=5 verticalSpacing=5}]
     [java]   invisible: Shell {Dialog Verification} [layout=GridLayout {numColumns=5 verticalSpacing=5}]
     [java]   invisible: Shell {Import} [layout=GridLayout {numColumns=5 verticalSpacing=5}]
     [java]   invisible: Shell {Dialog Verification} [layout=GridLayout {numColumns=5 verticalSpacing=5}]
     [java]   visible: Shell {Eclipse SDK} [layout=org.eclipse.e4.ui.workbench.renderers.swt.TrimmedPartLayout@56c93e2a]
     [java]   invisible: Shell {Dialog Verification} [layout=GridLayout {numColumns=5 verticalSpacing=5}]
     [java]   invisible: Shell {Import} [layout=GridLayout {numColumns=5 verticalSpacing=5}]
     [java]   invisible: Shell {Dialog Verification} [layout=GridLayout {numColumns=5 verticalSpacing=5}]
     [java]   visible: Shell {ui_sniff_folder - Eclipse SDK} [layout=org.eclipse.e4.ui.workbench.renderers.swt.TrimmedPartLayout@106ed503]
     [java]   invisible: Shell {Dialog Verification} [layout=GridLayout {numColumns=5 verticalSpacing=5}]
     [java]   invisible: Shell {Import} [layout=GridLayout {numColumns=5 verticalSpacing=5}]
     [java]   invisible: Shell {Dialog Verification} [layout=GridLayout {numColumns=5 verticalSpacing=5}]
     [java]   invisible: Shell {Import} [layout=GridLayout {numColumns=5 verticalSpacing=5}]
     [java]   invisible: Shell {Dialog Verification} [layout=GridLayout {numColumns=5 verticalSpacing=5}]
     [java]   invisible: Shell {Dialog Verification} [layout=GridLayout {numColumns=5 verticalSpacing=5}]
     [java]   invisible: Shell {Import} [layout=GridLayout {numColumns=5 verticalSpacing=5}]
     [java]   invisible: Shell {Dialog Verification} [layout=GridLayout {numColumns=5 verticalSpacing=5}]
     [java]   invisible: Shell {Preferences} [layout=GridLayout {numColumns=5 verticalSpacing=5}]
     [java]   invisible: Shell {Dialog Verification} [layout=GridLayout {numColumns=5 verticalSpacing=5}]
     [java]   invisible: Shell {Import} [layout=GridLayout {numColumns=5 verticalSpacing=5}]
     [java]   invisible: Shell {Dialog Verification} [layout=GridLayout {numColumns=5 verticalSpacing=5}]
     [java]   invisible: Shell {Import} [layout=GridLayout {numColumns=5 verticalSpacing=5}]
     [java]   invisible: Shell {Dialog Verification} [layout=GridLayout {numColumns=5 verticalSpacing=5}]
     [java]   visible: Shell {Eclipse SDK} [layout=org.eclipse.e4.ui.workbench.renderers.swt.TrimmedPartLayout@531cc386]
     [java]   invisible: Shell {} [layout=GridLayout {numColumns=5 verticalSpacing=5}]
     [java]   invisible: Shell {Import} [layout=GridLayout {numColumns=5 verticalSpacing=5}]
     [java]   invisible: Shell {Dialog Verification} [layout=GridLayout {numColumns=5 verticalSpacing=5}]
     [java]   invisible: Shell {Dialog Verification} [layout=GridLayout {numColumns=5 verticalSpacing=5}]

[jukzi]

the ui.tests failures reduced from 474 to 351 in
https://download.eclipse.org/eclipse/downloads/drops4/I20241010-1800/testResults.php

[BeckerWdf]

the ui.tests failures reduced from 474 to 351 in https://download.eclipse.org/eclipse/downloads/drops4/I20241010-1800/testResults.php

Great. Thanks for taking care...