fmt: fix import aliases in type declarations (#9483)

vlib/v/fmt/struct.v

@@ -118,10 +118,7 @@ pub fn (mut f Fmt) struct_decl(node ast.StructDecl) {
 	mut default_expr_aligns := []CommentAndExprAlignInfo{}
 	mut field_types := []string{cap: node.fields.len}
 	for i, field in node.fields {
-		mut ft := f.no_cur_mod(f.table.type_to_str_using_aliases(field.typ, f.mod2alias))
-		if !ft.contains('C.') && !ft.contains('JS.') && !ft.contains('fn (') && !ft.contains('chan') {
-			ft = f.short_module(ft)
-		}
+		ft := f.no_cur_mod(f.table.type_to_str_using_aliases(field.typ, f.mod2alias))
 		field_types << ft
 		attrs_len := inline_attrs_len(field.attrs)
 		end_pos := field.pos.pos + field.pos.len

vlib/v/fmt/tests/import_with_alias_keep.vv

@@ -1,5 +1,8 @@
 import os
 import time as t
+import some.library as slib
+
+type my_alias = fn (t slib.MyType)
 
 struct Foo {
 	bar     t.Time

vlib/v/table/types.v

@@ -922,8 +922,16 @@ fn (t Table) shorten_user_defined_typenames(originalname string, import_aliases
 	} else {
 		// types defined by the user
 		// mod.submod.submod2.Type => submod2.Type
-		parts := res.split('.')
-		res = if parts.len > 1 { parts[parts.len - 2..].join('.') } else { parts[0] }
+		mut parts := res.split('.')
+		if parts.len > 1 {
+			ind := parts.len - 2
+			if parts[ind] in import_aliases {
+				parts[ind] = import_aliases[parts[ind]]
+			}
+			res = parts[ind..].join('.')
+		} else {
+			res = parts[0]
+		}
 	}
 	return res
 }