Merge #8131

8131: Do smart case fuzzy search during flyimports r=SomeoneToIgnore a=SomeoneToIgnore

For now, last actionable part of https://rust-lang.zulipchat.com/#narrow/stream/185405-t-compiler.2Fwg-rls-2.2E0/topic/autoimport.20weirdness

Should help https://github.com/rust-analyzer/rust-analyzer/issues/7902

Now during the flyimport completion, if the input is searched case-sensitively, if the input contains any non-lowercase letters; otherwise the lookup done as before, case-insensitively.

Co-authored-by: Kirill Bulatov <[email protected]>

2 files changed, 58 insertions, 4 deletions

diff --git a/crates/ide_completion/src/completions/flyimport.rs b/crates/ide_completion/src/completions/flyimport.rs
index eb2cba631..1ad017198 100644
--- a/crates/ide_completion/src/completions/flyimport.rs
+++ b/crates/ide_completion/src/completions/flyimport.rs
@@ -1,8 +1,10 @@
 //! Feature: completion with imports-on-the-fly
 //!
 //! When completing names in the current scope, proposes additional imports from other modules or crates,
-//! if they can be qualified in the scope and their name contains all symbols from the completion input
-//! (case-insensitive, in any order or places).
+//! if they can be qualified in the scope and their name contains all symbols from the completion input.
+//!
+//! To be considered applicable, the name must contain all input symbols in the given order, not necessarily adjacent.
+//! If any input symbol is not lowercased, the name must contain all symbols in exact case; otherwise the contaning is checked case-insensitively.
 //!
 //! ```
 //! fn main() {
@@ -942,7 +944,7 @@ mod foo {
 }
 
 fn main() {
-    bar::Ass$0
+    bar::ASS$0
 }"#,
             expect![[]],
         )
@@ -979,4 +981,57 @@ fn main() {
             expect![[]],
         )
     }
+
+    #[test]
+    fn case_matters() {
+        check(
+            r#"
+mod foo {
+    pub const TEST_CONST: usize = 3;
+    pub fn test_function() -> i32 {
+        4
+    }
+}
+
+fn main() {
+    TE$0
+}"#,
+            expect![[r#"
+        ct foo::TEST_CONST
+    "#]],
+        );
+
+        check(
+            r#"
+mod foo {
+    pub const TEST_CONST: usize = 3;
+    pub fn test_function() -> i32 {
+        4
+    }
+}
+
+fn main() {
+    te$0
+}"#,
+            expect![[r#"
+        ct foo::TEST_CONST
+        fn test_function() (foo::test_function) fn() -> i32
+    "#]],
+        );
+
+        check(
+            r#"
+mod foo {
+    pub const TEST_CONST: usize = 3;
+    pub fn test_function() -> i32 {
+        4
+    }
+}
+
+fn main() {
+    Te$0
+}"#,
+            expect![[]],
+        );
+    }
 }
diff --git a/crates/ide_completion/src/lib.rs b/crates/ide_completion/src/lib.rs
index 87cddb98e..5ac1cb48d 100644
--- a/crates/ide_completion/src/lib.rs
+++ b/crates/ide_completion/src/lib.rs
@@ -161,7 +161,6 @@ pub fn resolve_completion_edits(
         items_locator::AssocItemSearch::Include,
         Some(items_locator::DEFAULT_QUERY_SEARCH_LIMIT),
     )
-    .into_iter()
     .filter_map(|candidate| {
         current_module
             .find_use_path_prefixed(db, candidate, config.insert_use.prefix_kind)