Viewport emit mouse_enter/exit even when dragging Control

[jeremyz]

fixes #20881
linked to #54552

add a boolean property to the Viewport to allow it to send mouse_entered and mouse_exited signals even when dragging (mouse button clicked) from a Control.

Test Scene:

[gd_scene load_steps=2 format=3 uid="uid://deqgi4hacbarj"]

[sub_resource type="GDScript" id="1"]
script/source = "extends Node2D

func _ready():
	var _r
	_r = $ViewportContainer/Viewport/b1.connect(\"mouse_entered\", _entered, [\"b1\"])
	_r = $ViewportContainer/Viewport/b1.connect(\"mouse_exited\", _exited, [\"b1\"])
	_r = $ViewportContainer/Viewport/b2.connect(\"mouse_entered\", _entered,[\"b2\"])
	_r = $ViewportContainer/Viewport/b2.connect(\"mouse_exited\", _exited,[\"b2\"])
	_r = $ViewportContainer/Viewport/ck.connect(\"toggled\", _toggled)

func _entered(who):
	print(\"mouse area entered : %s\" % who)

func _exited(who):
	print(\"mouse area exited : %s\" % who)

func _toggled(v):
	$ViewportContainer/Viewport.gui_force_mouse_events = v
"

[node name="Node2D" type="Node2D"]
script = SubResource( "1" )

[node name="ViewportContainer" type="SubViewportContainer" parent="."]
script = null
__meta__ = {
"_edit_use_anchors_": false
}

[node name="Viewport" type="SubViewport" parent="ViewportContainer"]
handle_input_locally = false
debug_draw = 3
size = Vector2i(800, 600)
render_target_update_mode = 4
script = null

[node name="b1" type="Button" parent="ViewportContainer/Viewport"]
offset_left = 150.0
offset_top = 100.0
rect_rotation = -23.2
focus_mode = 0
script = null
__meta__ = {
"_edit_use_anchors_": false
}

[node name="b2" type="Button" parent="ViewportContainer/Viewport"]
offset_left = 150.0
offset_top = 150.0
offset_right = 230.4604
offset_bottom = 380.158
rect_rotation = 38.7
rect_scale = Vector2(0.5, 0.5)
rect_pivot_offset = Vector2(1, 0)
focus_mode = 0
script = null
__meta__ = {
"_edit_use_anchors_": false
}

[node name="ck" type="CheckBox" parent="ViewportContainer/Viewport"]
offset_right = 24.0
offset_bottom = 31.0
script = null
__meta__ = {
"_edit_use_anchors_": false
}

[akien-mga]

Probably superseded by #67791. Could you check that PR to confirm?

[akien-mga]

Probably superseded by #67791. Could you check that PR to confirm?

No answer, so closing for now as likely superseded by #67791.