fix alignment of a struct's fields with the visual style

- rewrite_with_alignment was called from the expr module with the wrong
  shape that missed the extra offset needed for the visual style
- rewrite_with_alignment was indenting the given shape although that
  should have been the caller's responsability

src/expr.rs

@@ -1565,7 +1565,7 @@ fn rewrite_struct_lit<'a>(
         rewrite_with_alignment(
             fields,
             context,
-            shape,
+            v_shape,
             mk_sp(body_lo, span.hi()),
             one_line_width,
         )?

src/items.rs

@@ -1265,7 +1265,7 @@ pub fn format_struct_struct(
     let items_str = rewrite_with_alignment(
         fields,
         context,
-        Shape::indented(offset, context.config).sub_width(1)?,
+        Shape::indented(offset.block_indent(context.config), context.config).sub_width(1)?,
         mk_sp(body_lo, span.hi()),
         one_line_budget,
     )?;

src/vertical.rs

@@ -172,16 +172,13 @@ pub fn rewrite_with_alignment<T: AlignedItem>(
     } else {
         let rest_span = mk_sp(init_last_pos, span.hi());
         let rest_str = rewrite_with_alignment(rest, context, shape, rest_span, one_line_width)?;
-        Some(
-            result
-                + spaces
-                + "\n"
-                + &shape
-                    .indent
-                    .block_indent(context.config)
-                    .to_string(context.config)
-                + &rest_str,
-        )
+        Some(format!(
+            "{}{}\n{}{}",
+            result,
+            spaces,
+            &shape.indent.to_string(context.config),
+            &rest_str
+        ))
     }
 }
 
@@ -217,9 +214,8 @@ fn rewrite_aligned_items_inner<T: AlignedItem>(
     offset: Indent,
     one_line_width: usize,
 ) -> Option<String> {
-    let item_indent = offset.block_indent(context.config);
     // 1 = ","
-    let item_shape = Shape::indented(item_indent, context.config).sub_width(1)?;
+    let item_shape = Shape::indented(offset, context.config).sub_width(1)?;
     let (mut field_prefix_max_width, field_prefix_min_width) =
         struct_field_prefix_max_min_width(context, fields, item_shape);
     let max_diff = field_prefix_max_width.saturating_sub(field_prefix_min_width);

tests/source/alignment_2633/block_style.rs

@@ -0,0 +1,8 @@
+// rustfmt-struct_field_align_threshold: 50
+
+fn func() {
+    Ok(ServerInformation { name:         unwrap_message_string(items.get(0)),
+           vendor: unwrap_message_string(items.get(1)),
+           version: unwrap_message_string(items.get(2)),
+           spec_version: unwrap_message_string(items.get(3)), });
+}

tests/source/alignment_2633/visual_style.rs

@@ -0,0 +1,9 @@
+// rustfmt-struct_field_align_threshold: 50
+// rustfmt-indent_style: Visual
+
+fn func() {
+    Ok(ServerInformation { name:         unwrap_message_string(items.get(0)),
+           vendor: unwrap_message_string(items.get(1)),
+           version: unwrap_message_string(items.get(2)),
+           spec_version: unwrap_message_string(items.get(3)), });
+}

tests/target/alignment_2633/block_style.rs

@@ -0,0 +1,10 @@
+// rustfmt-struct_field_align_threshold: 50
+
+fn func() {
+    Ok(ServerInformation {
+        name:         unwrap_message_string(items.get(0)),
+        vendor:       unwrap_message_string(items.get(1)),
+        version:      unwrap_message_string(items.get(2)),
+        spec_version: unwrap_message_string(items.get(3)),
+    });
+}

tests/target/alignment_2633/visual_style.rs

@@ -0,0 +1,9 @@
+// rustfmt-struct_field_align_threshold: 50
+// rustfmt-indent_style: Visual
+
+fn func() {
+    Ok(ServerInformation { name:         unwrap_message_string(items.get(0)),
+                           vendor:       unwrap_message_string(items.get(1)),
+                           version:      unwrap_message_string(items.get(2)),
+                           spec_version: unwrap_message_string(items.get(3)), });
+}