Internal changes in SelectionTool regarding snap to grid transformation

These changes allow users to set the left (or right) mouse buttons as mapped shortcuts to the transform snap grid action, in order to automatically snap to grid while moving a selection.

src/Tools/SelectionTools/EllipseSelect.gd

@@ -8,7 +8,6 @@ var _displace_origin = false  # Mouse Click + Alt
 
 
 func _input(event: InputEvent) -> void:
-	._input(event)
 	if !_move and !_rect.has_no_area():
 		if event.is_action_pressed("shape_perfect"):
 			_square = true

src/Tools/SelectionTools/PolygonSelect.gd

@@ -6,7 +6,6 @@ var _ready_to_apply := false
 
 
 func _input(event: InputEvent) -> void:
-	._input(event)
 	if _move:
 		return
 	if event is InputEventMouseMotion:

src/Tools/SelectionTools/RectSelect.gd

@@ -8,7 +8,6 @@ var _displace_origin = false  # Mouse Click + Alt
 
 
 func _input(event: InputEvent) -> void:
-	._input(event)
 	if !_move and !_rect.has_no_area():
 		if event.is_action_pressed("shape_perfect"):
 			_square = true

src/Tools/SelectionTools/SelectionTool.gd

@@ -13,7 +13,6 @@ var _ongoing_selection := false
 var _add := false  # Shift + Mouse Click
 var _subtract := false  # Ctrl + Mouse Click
 var _intersect := false  # Shift + Ctrl + Mouse Click
-var _snap_to_grid := false  # Mouse Click + Ctrl
 
 # Used to check if the state of content transformation has been changed
 # while draw_move() is being called. For example, pressing Enter while still moving content
@@ -31,28 +30,12 @@ func _ready() -> void:
 	set_spinbox_values()
 
 
-func _input(event: InputEvent) -> void:
-	if _move:
-		if event.is_action_pressed("transform_snap_grid"):
-			_snap_to_grid = true
-			var grid_size := Vector2(Global.grid_width, Global.grid_height)
-			_offset = _offset.snapped(grid_size)
-			var prev_pos = selection_node.big_bounding_rectangle.position
-			selection_node.big_bounding_rectangle.position = prev_pos.snapped(grid_size)
-			selection_node.marching_ants_outline.offset += (
-				selection_node.big_bounding_rectangle.position
-				- prev_pos
-			)
-		elif event.is_action_released("transform_snap_grid"):
-			_snap_to_grid = false
-
-
 func set_spinbox_values() -> void:
 	var select_rect: Rect2 = selection_node.big_bounding_rectangle
 	xspinbox.editable = !select_rect.has_no_area()
-	yspinbox.editable = !select_rect.has_no_area()
+	yspinbox.editable = xspinbox.editable
-	wspinbox.editable = !select_rect.has_no_area()
+	wspinbox.editable = xspinbox.editable
-	hspinbox.editable = !select_rect.has_no_area()
+	hspinbox.editable = xspinbox.editable
 
 	xspinbox.value = select_rect.position.x
 	yspinbox.value = select_rect.position.y
@@ -149,7 +132,15 @@ func draw_move(position: Vector2) -> void:
 				position.y = _start_pos.y
 			else:
 				position.x = _start_pos.x
-		if _snap_to_grid:
+		if Input.is_action_pressed("transform_snap_grid"):
+			var grid_size := Vector2(Global.grid_width, Global.grid_height)
+			_offset = _offset.snapped(grid_size)
+			var prev_pos = selection_node.big_bounding_rectangle.position
+			selection_node.big_bounding_rectangle.position = prev_pos.snapped(grid_size)
+			selection_node.marching_ants_outline.offset += (
+				selection_node.big_bounding_rectangle.position
+				- prev_pos
+			)
 			position = position.snapped(Vector2(Global.grid_width, Global.grid_height))
 			position += Vector2(Global.grid_offset_x, Global.grid_offset_y)
 
@@ -173,7 +164,6 @@ func draw_end(position: Vector2) -> void:
 			apply_selection(position)
 
 	_move = false
-	_snap_to_grid = false
 	cursor_text = ""