Dedup imports_granularity = "Item" (rust-lang#4737)

* Fix for issue 4725 - dedup Item imports_granularity (2nd version)

* Use unique() instead of unique_by()

Author: davidBar-On

src/imports.rs

@@ -2,6 +2,10 @@ use std::borrow::Cow;
 use std::cmp::Ordering;
 use std::fmt;
 
+use core::hash::{Hash, Hasher};
+
+use itertools::Itertools;
+
 use rustc_ast::ast::{self, UseTreeKind};
 use rustc_span::{
     symbol::{self, sym},
@@ -87,7 +91,7 @@ impl<'a> FmtVisitor<'a> {
 // sorting.
 
 // FIXME we do a lot of allocation to make our own representation.
-#[derive(Clone, Eq, PartialEq)]
+#[derive(Clone, Eq, Hash, PartialEq)]
 pub(crate) enum UseSegment {
     Ident(String, Option<String>),
     Slf(Option<String>),
@@ -232,10 +236,13 @@ fn flatten_use_trees(
     use_trees: Vec<UseTree>,
     import_granularity: ImportGranularity,
 ) -> Vec<UseTree> {
+    // Return non-sorted single occurance of the use-trees text string;
+    // order is by first occurance of the use-tree.
     use_trees
         .into_iter()
         .flat_map(|tree| tree.flatten(import_granularity))
         .map(UseTree::nest_trailing_self)
+        .unique()
         .collect()
 }
 
@@ -780,6 +787,12 @@ fn merge_use_trees_inner(trees: &mut Vec<UseTree>, use_tree: UseTree, merge_by:
     trees.sort();
 }
 
+impl Hash for UseTree {
+    fn hash<H: Hasher>(&self, state: &mut H) {
+        self.path.hash(state);
+    }
+}
+
 impl PartialOrd for UseSegment {
     fn partial_cmp(&self, other: &UseSegment) -> Option<Ordering> {
         Some(self.cmp(other))

tests/source/imports-impl-only-use.rs renamed to tests/source/imports/imports-impl-only-use.rs

@@ -0,0 +1,6 @@
+use crate::lexer;
+use crate::lexer::tokens::TokenData;
+use crate::lexer::{tokens::TokenData};
+use crate::lexer::self;
+use crate::lexer::{self};
+use crate::lexer::{self, tokens::TokenData};

tests/source/imports-reorder-lines-and-items.rs renamed to tests/source/imports/imports-reorder-lines-and-items.rs

@@ -0,0 +1,13 @@
+// rustfmt-imports_granularity: Item
+// rustfmt-reorder_imports: false
+// rustfmt-group_imports: StdExternalCrate
+
+use crate::lexer;
+use crate::lexer;
+use crate::lexer::tokens::TokenData;
+use crate::lexer::{tokens::TokenData};
+use crate::lexer::self;
+use crate::lexer;
+use crate::lexer;
+use crate::lexer::{self};
+use crate::lexer::{self, tokens::TokenData};