checker: fix generic resolve for external module generic static method call (fix #21476) (#25634)

Author: felipensp

vlib/v/checker/fn.v

@@ -1157,6 +1157,9 @@ fn (mut c Checker) fn_call(mut node ast.CallExpr, mut continue_check &bool) ast.
 					func = f
 					node.name = qualified_name
 					unsafe { c.table.fns[qualified_name].usages++ }
+					if !c.table.register_fn_concrete_types(f.name, concrete_types) {
+						c.need_recheck_generic_fns = true
+					}
 					break
 				}
 			}

vlib/v/tests/project_issue_21476/foo.v

@@ -0,0 +1,7 @@
+module zmod_foo
+
+pub struct Foo[T] {}
+
+pub fn Foo.new[T](embed T) &Foo[T] {
+	return &Foo[T]{}
+}

vlib/v/tests/project_issue_21476/main.v

@@ -0,0 +1,12 @@
+module main
+
+import zmod_foo { Foo }
+
+struct Bar {}
+
+fn main() {
+	// note: will succeed with foo.Foo
+	f := Foo.new[Bar](Bar{})
+
+	println(typeof(f).name)
+}

vlib/v/tests/project_issue_21476/project_compiles_test.v

@@ -0,0 +1,5 @@
+module main
+
+fn test_compiles() {
+	assert true
+}