Workaround for #316 and fix for Viewport resizing

This makes the screenshot tool functional again, but doesn't close the issue since it's a workaround that seems like it might not be 100% stable

Global/Screencapture.gd

@@ -38,13 +38,17 @@ func screenshot(
 	pos_manager.get_viewport().set_use_taa(false)
 	pos_manager.get_viewport().set_msaa_3d(Viewport.MSAA_MAX)
 
+	pos_manager.get_viewport().get_parent().stretch = false
 	pos_manager.get_viewport().size = previous_viewport_size * upscale_viewport
 	Vegetation.plant_extent_factor = plant_extent
 
 	#await get_tree().create_timer(1).timeout
 
 	RenderingServer.force_sync()
 	RenderingServer.force_draw()
+	await get_tree().process_frame
+	await get_tree().process_frame
+	await get_tree().process_frame
 
 	# get data of the viewport
 	var image = pos_manager.get_viewport().get_texture().get_image()
@@ -53,12 +57,15 @@ func screenshot(
 	image.save_png(image_name)
 
 	# Reset to prior configuration
-	pos_manager.get_viewport().size = previous_viewport_size
+	pos_manager.get_viewport().get_parent().stretch = true
 	Vegetation.plant_extent_factor = previous_plant_extent_factor
 	pos_manager.get_viewport().set_use_taa(taa_before)
 	pos_manager.get_viewport().set_msaa_3d(msaa_before)
 
 	RenderingServer.force_sync()
 	RenderingServer.force_draw()
+	await get_tree().process_frame
+	await get_tree().process_frame
+	await get_tree().process_frame
 
 	screenshot_finished.emit()

Layers/Renderers/RasterVegetation/VegetationParticles.gd

@@ -199,7 +199,7 @@ func apply_data():
 	# Row crops
 	if density_class.id == 6:
 		process_material.set_shader_parameter("row_spacing", 3.0)
-	
+
 
 func apply_wind_speed(wind_speed):
 	material_override.set_shader_parameter("speed", Vector2(wind_speed, wind_speed) / 160.0)

Layers/Renderers/RasterVegetation/VegetationParticles.tscn

@@ -39,10 +39,9 @@ shader_parameter/uv_offset = null
 [node name="VegetationParticles" type="GPUParticles3D"]
 layers = 2
 material_override = SubResource("ShaderMaterial_oyqth")
-cast_shadow = 0
 amount = 1
 explosiveness = 1.0
-fixed_fps = 0
+fixed_fps = 1
 interpolate = false
 fract_delta = false
 visibility_aabb = AABB(-150, -150, -150, 300, 300, 300)