Support new SWT dirty indicator in StackRenderer

[vogella]

This change enables the new bullet-style dirty indicator for tabs in StackRenderer, which overlays the close button.

It implements the following:

• Added a preference to enable this functionality in the Views preference page.
• StackRenderer now calls setDirtyIndicatorStyle at the folder level.
• setShowDirty is called on individual tab items when dirty state changes.
• Preference changes at runtime are handled, updating all visible stacks.
• Traditional '*' prefix is skipped when the new bullet-style indicator is active.

This PR works with the changes introduced in eclipse-platform/eclipse.platform.swt#3141.

[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.e4.ui.css.swt/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 58236dd691ffc0178d51d28c4e1f499602d7ce9c Mon Sep 17 00:00:00 2001
From: Eclipse Platform Bot <platform-bot@eclipse.org>
Date: Thu, 26 Mar 2026 18:27:23 +0000
Subject: [PATCH] Version bump(s) for 4.40 stream


diff --git a/bundles/org.eclipse.e4.ui.css.swt/META-INF/MANIFEST.MF b/bundles/org.eclipse.e4.ui.css.swt/META-INF/MANIFEST.MF
index 01e69485e3..dcdb5e262b 100644
--- a/bundles/org.eclipse.e4.ui.css.swt/META-INF/MANIFEST.MF
+++ b/bundles/org.eclipse.e4.ui.css.swt/META-INF/MANIFEST.MF
@@ -1,7 +1,7 @@
 Manifest-Version: 1.0
 Bundle-ManifestVersion: 2
 Bundle-SymbolicName: org.eclipse.e4.ui.css.swt;singleton:=true
-Bundle-Version: 0.16.0.qualifier
+Bundle-Version: 0.16.100.qualifier
 Bundle-Name: %pluginName
 Bundle-Vendor: %providerName
 Bundle-Localization: plugin
-- 
2.53.0

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

[github-actions]

Test Results

   852 files  ±0     852 suites  ±0   54m 55s ⏱️ - 1m 4s
 7 899 tests ±0   7 656 ✅ ±0  243 💤 ±0  0 ❌ ±0 
20 199 runs  ±0  19 544 ✅ ±0  655 💤 ±0  0 ❌ ±0 

Results for commit fe1a1b4. ± Comparison against base commit dceb45a.

♻️ This comment has been updated with latest results.

[merks]

Is it intentional that this PR includes 2 commits one of which is about rounded corners? It's kind of confusing...

[vogella]

Is it intentional that this PR includes 2 commits one of which is about rounded corners? It's kind of confusing...

fixed

[vogella]

@schneidermic0 any feedback here? Can you help with testing this change?

[vogella]

I used this with a local build and it looks good.

Needs to be activated for now, maybe we want to change the default later.

[vogella]

Light theme (with hover over close)