Always consider fragments that specify a platform filter

A fragment can declare a Eclipse-PlatformFilter to be only installed on
a given platform. If such fragment is currently wired to a host bundle,
it is quite likely that fragment is needed but the host usually do not
declare an Eclipse-ExtensibleAPI so we currently miss to add such
fragment making the native code loading fails.

This now adds some code to store the platform filter and if one is given
the fragment is always included.

Fix #1929

Author: laeubi

ui/org.eclipse.pde.core/src/org/eclipse/pde/internal/core/ClasspathUtilCore.java

@@ -224,6 +224,17 @@ public static boolean hasExtensibleAPI(IPluginModelBase model) {
 		return false;
 	}
 
+	public static String getPlatformFilter(IPluginModelBase model) {
+		IPluginBase pluginBase = model.getPluginBase();
+		if (pluginBase instanceof BundlePlugin plugin) {
+			return plugin.getPlatformFilter();
+		}
+		if (pluginBase instanceof BundleFragment fragment) {
+			return fragment.getPlatformFilter();
+		}
+		return null;
+	}
+
 	public static boolean isPatchFragment(Resource desc) {
 		IPluginModelBase model = PluginRegistry.findModel(desc);
 		return model instanceof IFragmentModel i ? isPatchFragment(i.getFragment()) : false;

ui/org.eclipse.pde.core/src/org/eclipse/pde/internal/core/DependencyManager.java

@@ -195,6 +195,12 @@ public static Set<BundleDescription> findRequirementsClosure(Collection<BundleDe
 						addNewRequiredBundle(fragment, closure, pending);
 					}
 				}
+			} else {
+				for (BundleDescription fragment : bundle.getFragments()) {
+					if (isNativeFragment(fragment) && !isTestWorkspaceProject(fragment)) {
+						addNewRequiredBundle(fragment, closure, pending);
+					}
+				}
 			}
 
 			if (isFragment(wiring.getRevision())) {
@@ -231,6 +237,14 @@ public static Set<BundleDescription> findRequirementsClosure(Collection<BundleDe
 		return closure;
 	}
 
+	private static boolean isNativeFragment(BundleDescription fragment) {
+		Object userObject = fragment.getUserObject();
+		if (userObject instanceof IPluginModelBase model) {
+			return ClasspathUtilCore.getPlatformFilter(model) != null;
+		}
+		return false;
+	}
+
 	private static boolean isExtensibleApi(BundleDescription bundleDescription) {
 		if (bundleDescription.getFragments().length == 0) {
 			return false;

ui/org.eclipse.pde.core/src/org/eclipse/pde/internal/core/PDEAuxiliaryState.java

@@ -97,6 +97,7 @@ static class PluginInfo {
 		String localization;
 		String bundleSourceEntry;
 		boolean exportsExternalAnnotations;
+		public String platformFilter;
 	}
 
 	/**
@@ -379,6 +380,7 @@ protected void addAuxiliaryData(BundleDescription desc, Map<String, String> mani
 		info.libraries = getClasspath(manifest);
 		info.hasExtensibleAPI = "true".equals(manifest.get(ICoreConstants.EXTENSIBLE_API)); //$NON-NLS-1$
 		info.isPatchFragment = "true".equals(manifest.get(ICoreConstants.PATCH_FRAGMENT)); //$NON-NLS-1$
+		info.platformFilter = manifest.get(ICoreConstants.PLATFORM_FILTER);
 		info.localization = manifest.get(Constants.BUNDLE_LOCALIZATION);
 		info.hasBundleStructure = hasBundleStructure;
 		info.bundleSourceEntry = manifest.get(ICoreConstants.ECLIPSE_SOURCE_BUNDLE);

ui/org.eclipse.pde.core/src/org/eclipse/pde/internal/core/bundle/BundleFragment.java

@@ -122,4 +122,8 @@ public boolean isPatch() {
 		return "true".equals(getValue(ICoreConstants.PATCH_FRAGMENT, false)); //$NON-NLS-1$
 	}
 
+	public String getPlatformFilter() {
+		return getValue(ICoreConstants.PLATFORM_FILTER, false);
+	}
+
 }

ui/org.eclipse.pde.core/src/org/eclipse/pde/internal/core/bundle/BundlePlugin.java

@@ -57,4 +57,8 @@ public boolean exportsExternalAnnotations() {
 		return "true".equals(getValue(ICoreConstants.ECLIPSE_EXPORT_EXTERNAL_ANNOTATIONS, false)); //$NON-NLS-1$
 	}
 
+	public String getPlatformFilter() {
+		return getValue(ICoreConstants.PLATFORM_FILTER, false);
+	}
+
 }