Fix: Improve UI event processing in AbstractTargetEditorTest

[vogella]

Stabilizes flaky UI tests by ensuring all pending UI events are processed during editor activation. The event loop in now
drains the event queue completely in each iteration and includes a short sleep to allow asynchronous operations to complete.

[eclipse-pde-bot]

This pull request changes some projects for the first time in this development cycle.
Therefore the following files need a version increment:

ui/org.eclipse.pde.genericeditor.extension.tests/META-INF/MANIFEST.MF
ui/org.eclipse.pde.genericeditor.extension.tests/pom.xml

An additional commit containing all the necessary changes was pushed to the top of this PR's branch. To obtain these changes (for example if you want to push more changes) either fetch from your fork or apply the git patch.

Git patch

From cdde44a92c4b5f8ed132b505b1557a6d196278e3 Mon Sep 17 00:00:00 2001
From: Eclipse PDE Bot <pde-bot@eclipse.org>
Date: Fri, 5 Dec 2025 17:30:14 +0000
Subject: [PATCH] Version bump(s) for 4.39 stream


diff --git a/ui/org.eclipse.pde.genericeditor.extension.tests/META-INF/MANIFEST.MF b/ui/org.eclipse.pde.genericeditor.extension.tests/META-INF/MANIFEST.MF
index 105df5f988..035112ee37 100644
--- a/ui/org.eclipse.pde.genericeditor.extension.tests/META-INF/MANIFEST.MF
+++ b/ui/org.eclipse.pde.genericeditor.extension.tests/META-INF/MANIFEST.MF
@@ -2,7 +2,7 @@ Manifest-Version: 1.0
 Bundle-ManifestVersion: 2
 Bundle-Name: Tests for Generic Target Platform Editor
 Bundle-SymbolicName: org.eclipse.pde.genericeditor.extension.tests
-Bundle-Version: 1.3.100.qualifier
+Bundle-Version: 1.3.200.qualifier
 Bundle-Vendor: Eclipse.org
 Bundle-RequiredExecutionEnvironment: JavaSE-21
 Require-Bundle: org.eclipse.core.runtime;bundle-version="[3.29.0,4.0.0)",
diff --git a/ui/org.eclipse.pde.genericeditor.extension.tests/pom.xml b/ui/org.eclipse.pde.genericeditor.extension.tests/pom.xml
index 54ee25fd59..e1527231e5 100644
--- a/ui/org.eclipse.pde.genericeditor.extension.tests/pom.xml
+++ b/ui/org.eclipse.pde.genericeditor.extension.tests/pom.xml
@@ -18,7 +18,7 @@
     <relativePath>../../</relativePath>
   </parent>
   <artifactId>org.eclipse.pde.genericeditor.extension.tests</artifactId>
-  <version>1.3.100-SNAPSHOT</version>
+  <version>1.3.200-SNAPSHOT</version>
   <packaging>eclipse-test-plugin</packaging>
 
   <properties>
-- 
2.52.0

Further information are available in Common Build Issues - Missing version increments.

[github-actions]

Test Results

   771 files  ±0     771 suites  ±0   59m 58s ⏱️ + 2m 28s
 3 648 tests ±0   3 594 ✅ ±0   54 💤 ±0  0 ❌ ±0 
10 878 runs  ±0  10 715 ✅ ±0  163 💤 ±0  0 ❌ ±0 

Results for commit 0a9922a. ± Comparison against base commit 5d4bf0c.