Clicking new scene from "Scene" popup menu opens 2 new scene tabs

[EricEzaM]

Godot version:
Godot Engine v4.0.dev.custom_build.d817be92c
Does NOT occur on 3.2 Stable

OS/device including version:
Win 10 1903

Issue description:
Scene > New Scene opens 2 scene tabs, not one (2 new scenes are created)

Steps to reproduce:
As above.

Minimal reproduction project:
N/A

Via breakpoints I have seen that

godot/scene/gui/popup_menu.cpp

Lines 296 to 304 in d817be9

	Ref<InputEventMouseButton> b = p_event;
	if (b.is_valid()) {
	if (b->is_pressed())
	return;
	int button_idx = b->get_button_index();
	switch (button_idx) {

Is reached twice, both with pressed = false.
Through some print strings at:

godot/scene/main/window.cpp

Line 884 in d817be9

void Window::_window_input(const Ref<InputEvent> &p_ev) {

The mouse up (pressed = false) event is being fired twice.

I think this issue is beyond my knowledge at this stage.

[KoBeWi]

Could be related to #37331 (and thus will fixed by the same PR)

[akien-mga]

Assuming fixed by #37519 as mentioned by @KoBeWi. Please comment if you can still reproduce it.