Auto merge of #15486 - petr-tik:n15134_hide_private_from_autocomplete_2, r=Veykril

fix: Fix item tree lowering pub(self) to pub()

Prior to this, the item tree lowered `pub(self)` visibility to `pub()`
Fix #15134 - tested with a unit test and
a manual end-to-end test of building rust-analyzer from my branch and opening the reproduction repository

crates/hir-def/src/item_tree/tests.rs

@@ -370,3 +370,15 @@ fn generics_with_attributes() {
         "#]],
     )
 }
+
+#[test]
+fn pub_self() {
+    check(
+        r#"
+pub(self) struct S;
+        "#,
+        expect![[r#"
+            pub(self) struct S;
+        "#]],
+    )
+}

crates/hir-def/src/nameres/path_resolution.rs

@@ -96,8 +96,8 @@ pub(crate) fn resolve_visibility(
                 let types = result.take_types()?;
                 match types {
                     ModuleDefId::ModuleId(m) => Visibility::Module(m),
+                    // error: visibility needs to refer to module
                     _ => {
-                        // error: visibility needs to refer to module
                         return None;
                     }
                 }

crates/hir-def/src/visibility.rs

@@ -73,7 +73,7 @@ pub(crate) fn from_ast_with_span_map_and_default(
                 RawVisibility::Module(path)
             }
             ast::VisibilityKind::PubSelf => {
-                let path = ModPath::from_kind(PathKind::Plain);
+                let path = ModPath::from_kind(PathKind::Super(0));
                 RawVisibility::Module(path)
             }
             ast::VisibilityKind::Pub => RawVisibility::Public,

crates/ide-completion/src/tests/special.rs

@@ -1286,6 +1286,30 @@ fn here_we_go()           fn()
     );
 }
 
+#[test]
+fn completes_only_public() {
+    check(
+        r#"
+//- /e.rs
+pub(self) fn i_should_be_hidden() {}
+pub(in crate::e) fn i_should_also_be_hidden() {}
+pub fn i_am_public () {}
+
+//- /lib.rs crate:krate
+pub mod e;
+
+//- /main.rs deps:krate crate:main
+use krate::e;
+fn main() {
+    e::$0
+}"#,
+        expect![
+            "fn i_am_public() fn()
+"
+        ],
+    )
+}
+
 #[test]
 fn completion_filtering_excludes_non_identifier_doc_aliases() {
     check_edit(