Use SubMonintor in CheckConditionsContext

[vogella]

done() call not necessary here and convert can also handle null. Also split will also check for cancellation so the additional cancellation check is not necessary.

See https://www.eclipse.org/articles/Article-Progress-Monitors/article.html

[github-actions]

Test Results

 3 024 files  ±0   3 024 suites  ±0   2h 18m 0s ⏱️ + 1m 16s
 8 234 tests ±0   7 986 ✅ ±0  248 💤 ±0  0 ❌ ±0 
23 526 runs  ±0  22 735 ✅ ±0  791 💤 ±0  0 ❌ ±0 

Results for commit 2b4aea3. ± Comparison against base commit 89a19bf.

♻️ This comment has been updated with latest results.

[eclipse-platform-bot]

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

bundles/org.eclipse.ltk.core.refactoring/META-INF/MANIFEST.MF

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 19d5a11b7b45fdbf0d6617f6762b79e2833994d6 Mon Sep 17 00:00:00 2001
From: Eclipse Platform Bot <platform-bot@eclipse.org>
Date: Wed, 17 Dec 2025 16:00:01 +0000
Subject: [PATCH] Version bump(s) for 4.39 stream


diff --git a/bundles/org.eclipse.ltk.core.refactoring/META-INF/MANIFEST.MF b/bundles/org.eclipse.ltk.core.refactoring/META-INF/MANIFEST.MF
index a4fdac38f2..9f0f659919 100644
--- a/bundles/org.eclipse.ltk.core.refactoring/META-INF/MANIFEST.MF
+++ b/bundles/org.eclipse.ltk.core.refactoring/META-INF/MANIFEST.MF
@@ -3,7 +3,7 @@ Automatic-Module-Name: org.eclipse.ltk.core.refactoring
 Bundle-ManifestVersion: 2
 Bundle-Name: %pluginName
 Bundle-SymbolicName: org.eclipse.ltk.core.refactoring; singleton:=true
-Bundle-Version: 3.15.100.qualifier
+Bundle-Version: 3.15.200.qualifier
 Bundle-Activator: org.eclipse.ltk.internal.core.refactoring.RefactoringCorePlugin
 Bundle-ActivationPolicy: lazy
 Bundle-Vendor: %providerName
-- 
2.52.0

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

[vogella]

@ptziegler can you review?

[vogella]

Planning to merge for next release once master opens up