:beetle: Fix zoom effect on firefox physics slide

Because the slide is zoomed out, and the physics engine has the control
over zoom, the firefox logos where to big.

Solution : use a viewport, same technic as 3D in 2D.

godot/slides/204/PhysicsEngine.tscn

@@ -1,13 +1,24 @@
 [gd_scene load_steps=5 format=3 uid="uid://cfr23honh8ul7"]
 
 [ext_resource type="Script" uid="uid://dujtdgtfgki4c" path="res://addons/slide_show/projector/slide/Slide.gd" id="1_ag2av"]
+[ext_resource type="PackedScene" uid="uid://dtj3anpduro3e" path="res://slides/204/physics_demo/physics_demo.tscn" id="2_u43ho"]
 [ext_resource type="PackedScene" uid="uid://bvrtmyq4g1qes" path="res://common/components/title/title.tscn" id="2_xa84e"]
-[ext_resource type="PackedScene" uid="uid://dpbr2u8co4824" path="res://slides/204/physics_demo/Bar.tscn" id="4_l048w"]
-[ext_resource type="Script" uid="uid://cqv2vfpwp78h2" path="res://slides/204/physics_demo/Spawner.gd" id="5_g1qkm"]
+
+[sub_resource type="ViewportTexture" id="ViewportTexture_au5no"]
+viewport_path = NodePath("SubViewport")
 
 [node name="PhysicsEngine" type="Node2D"]
 script = ExtResource("1_ag2av")
-processing_keep_when_disabled = true
+
+[node name="SubViewport" type="SubViewport" parent="."]
+size = Vector2i(1920, 1080)
+
+[node name="Demo" parent="SubViewport" instance=ExtResource("2_u43ho")]
+
+[node name="ViewportDisplay" type="TextureRect" parent="."]
+offset_right = 1920.0
+offset_bottom = 1080.0
+texture = SubResource("ViewportTexture_au5no")
 
 [node name="Title" parent="." instance=ExtResource("2_xa84e")]
 offset_left = 41.0
@@ -15,29 +26,3 @@ offset_top = 28.0
 offset_right = 1800.0
 offset_bottom = 196.0
 text = "Moteur physique"
-
-[node name="Demo" type="Node2D" parent="."]
-
-[node name="Bar1" parent="Demo" instance=ExtResource("4_l048w")]
-position = Vector2(948, 473)
-rotation = 0.785397
-
-[node name="Bar2" parent="Demo" instance=ExtResource("4_l048w")]
-position = Vector2(1128, 954)
-
-[node name="Bar3" parent="Demo" instance=ExtResource("4_l048w")]
-position = Vector2(421, 911)
-rotation = 0.261799
-
-[node name="Bar4" parent="Demo" instance=ExtResource("4_l048w")]
-position = Vector2(1258, 634)
-rotation = -0.785397
-
-[node name="Bar5" parent="Demo" instance=ExtResource("4_l048w")]
-position = Vector2(760, 728)
-
-[node name="Spawner" type="Marker2D" parent="Demo"]
-position = Vector2(906, 239)
-script = ExtResource("5_g1qkm")
-dispersion_scale = Vector2(80, 40)
-delay = 0.25

godot/slides/204/physics_demo/physics_demo.tscn

@@ -0,0 +1,30 @@
+[gd_scene load_steps=3 format=3 uid="uid://dtj3anpduro3e"]
+
+[ext_resource type="PackedScene" uid="uid://dpbr2u8co4824" path="res://slides/204/physics_demo/Bar.tscn" id="1_mm234"]
+[ext_resource type="Script" uid="uid://cqv2vfpwp78h2" path="res://slides/204/physics_demo/Spawner.gd" id="2_tlo74"]
+
+[node name="Demo" type="Node2D"]
+
+[node name="Bar1" parent="." instance=ExtResource("1_mm234")]
+position = Vector2(948, 473)
+rotation = 0.785397
+
+[node name="Bar2" parent="." instance=ExtResource("1_mm234")]
+position = Vector2(1128, 954)
+
+[node name="Bar3" parent="." instance=ExtResource("1_mm234")]
+position = Vector2(421, 911)
+rotation = 0.261799
+
+[node name="Bar4" parent="." instance=ExtResource("1_mm234")]
+position = Vector2(1258, 634)
+rotation = -0.785397
+
+[node name="Bar5" parent="." instance=ExtResource("1_mm234")]
+position = Vector2(760, 728)
+
+[node name="Spawner" type="Marker2D" parent="."]
+position = Vector2(906, 239)
+script = ExtResource("2_tlo74")
+dispersion_scale = Vector2(80, 40)
+delay = 0.25