Infer project root correctly from within target folder

rascal-lsp/src/main/java/org/rascalmpl/vscode/lsp/rascal/model/PathConfigs.java

@@ -243,7 +243,23 @@ private static boolean hasParentSection(URIResolverRegistry reg, ISourceLocation
         }
     }
 
+    /**
+     * Infers the root of the project that `member` is in.
+     */
     private static ISourceLocation inferProjectRoot(ISourceLocation member) {
+        ISourceLocation lastRoot = member;
+        ISourceLocation root;
+        do {
+            root = lastRoot;
+            lastRoot = inferDeepestProjectRoot(URIUtil.getParentLocation(root));
+        } while (!lastRoot.equals(URIUtil.getParentLocation(root)));
+        return root;
+    }
+
+    /**
+     * Infers the longest project root-like path that `member` is in. Might return a sub-directory of `target/`.
+     */
+    private static ISourceLocation inferDeepestProjectRoot(ISourceLocation member) {
         ISourceLocation current = member;
         URIResolverRegistry reg = URIResolverRegistry.getInstance();
         if (!reg.isDirectory(current)) {
@@ -254,13 +270,13 @@ private static ISourceLocation inferProjectRoot(ISourceLocation member) {
             if (reg.exists(URIUtil.getChildLocation(current, "META-INF/RASCAL.MF"))) {
                 return current;
             }
-
-            if (URIUtil.getParentLocation(current).equals(current)) {
+            var parent = URIUtil.getParentLocation(current);
+            if (parent.equals(current)) {
                 // we went all the way up to the root
                 return reg.isDirectory(member) ? member : URIUtil.getParentLocation(member);
             }
 
-            current = URIUtil.getParentLocation(current);
+            current = parent;
         }
 
         return current;

rascal-lsp/src/main/rascal/lsp/lang/rascal/lsp/IDECheckerWrapper.rsc

@@ -207,7 +207,21 @@ loc targetToProject(loc l) {
 }
 
 @memo
+@synopsis{Infers the root of the project that `member` is in.}
 loc inferProjectRoot(loc member) {
+    parentRoot = member;
+    root = parentRoot;
+
+    do {
+        root = parentRoot;
+        parentRoot = inferDeepestProjectRoot(root.parent);
+    } while (root.parent? && parentRoot != root.parent);
+    return root;
+}
+
+@synopsis{Infers the longest project root-like path that `member` is in.}
+@pitfalls{Might return a sub-directory of `target/`.}
+loc inferDeepestProjectRoot(loc member) {
     current = targetToProject(member);
     if (!isDirectory(current)) {
         current = current.parent;