Доработка, светлая тема. Решено с нагрузкой

table/editl.gd

@@ -1,9 +1,11 @@
 extends LineEdit
 
-func _ready():
-    _update_background()
 
-func _update_background() -> void:
+func _enter_tree() -> void:
+    ProjectSettings.connect('settings_changed', apply_colors)
+
+
+func apply_colors():
     var is_light: bool = ProjectSettings.get_setting("application/config/Цвет темы программы", false)
     var style = get_theme_stylebox("read_only").duplicate()
     if is_light:

table/lable.gd

@@ -1,12 +1,11 @@
 extends Label
 
-func _ready():
-    _update_background()
 
-func _process(_delta):
-    _update_background()
-    
-func _update_background() -> void:
+func _enter_tree() -> void:
+    ProjectSettings.connect('settings_changed', apply_colors)
+
+
+func apply_colors():
     var is_light: bool = ProjectSettings.get_setting("application/config/Цвет темы программы", false)
     var style = get_theme_stylebox("normal").duplicate()
     if is_light:

table/node.gd

@@ -1,16 +1,19 @@
 extends LineEdit
 
-func _ready():
-    _update_background()
 
-func _process(_delta):
-    _update_background()
-    
-func _update_background() -> void:
+func _enter_tree() -> void:
+    ProjectSettings.connect('settings_changed', apply_colors)
+
+
+func apply_colors():
     var is_light: bool = ProjectSettings.get_setting("application/config/Цвет темы программы", false)
     var style = get_theme_stylebox("read_only").duplicate()
     if is_light:
         style.bg_color = Color.GRAY
+        add_theme_color_override("font_color_readonly", Color.BLACK)
+        add_theme_color_override("font_color_placeholder", Color(0, 0, 0, 0.5))
     else:
         style.bg_color = Color(0.12, 0.12, 0.12)
+        add_theme_color_override("font_color_readonly", Color("#D8731A")) # тёмно-оранжевый
+        add_theme_color_override("font_color_placeholder", Color(1, 1, 1, 0.5))
     add_theme_stylebox_override("read_only", style)

table/set-toggle.gd

@@ -1,12 +1,19 @@
 extends LineEdit
 
-func _ready():
-    _update_background()
+var checkbutton_material: Material
 
-func _process(_delta):
-    _update_background()
-    
-func _update_background() -> void:
+
+func _enter_tree() -> void:
+    ProjectSettings.connect('settings_changed', on_setting_changed)
+
+
+func on_setting_changed():
+    var cb = $CheckButton
+    checkbutton_material = cb.material
+    apply_colors()
+
+
+func apply_colors():
     var is_light: bool = ProjectSettings.get_setting("application/config/Цвет темы программы", false)
     var style = get_theme_stylebox("read_only").duplicate()
     if is_light:
@@ -14,3 +21,8 @@ func _update_background() -> void:
     else:
         style.bg_color = Color(0.12, 0.12, 0.12)
     add_theme_stylebox_override("read_only", style)
+    var cb = $CheckButton
+    if is_light:
+        cb.material = null
+    else:
+        cb.material = checkbutton_material

table/set-toggle.tscn

@@ -1,9 +1,13 @@
-[gd_scene load_steps=6 format=3 uid="uid://dgidt8lifm7xe"]
+[gd_scene load_steps=8 format=3 uid="uid://dgidt8lifm7xe"]
 
 [ext_resource type="Script" uid="uid://btvrqnnjjum20" path="res://table/set-toggle.gd" id="1_kvru5"]
+[ext_resource type="Shader" uid="uid://bw5mmbgeycwua" path="res://shaders/color-invers.gdshader" id="2_wrw87"]
 
 [sub_resource type="StyleBoxEmpty" id="StyleBoxEmpty_f4oye"]
 
+[sub_resource type="ShaderMaterial" id="ShaderMaterial_wrw87"]
+shader = ExtResource("2_wrw87")
+
 [sub_resource type="StyleBoxEmpty" id="StyleBoxEmpty_t3fqw"]
 
 [sub_resource type="Theme" id="Theme_odxqp"]
@@ -19,6 +23,7 @@ editable = false
 script = ExtResource("1_kvru5")
 
 [node name="CheckButton" type="CheckButton" parent="."]
+material = SubResource("ShaderMaterial_wrw87")
 layout_mode = 0
 offset_left = 21.0
 offset_top = 1.0

table/settings-toggle.gd

@@ -1,12 +1,19 @@
 extends LineEdit
 
-func _ready():
-    _update_background()
+var checkbutton_material: Material
 
-func _process(_delta):
-    _update_background()
-    
-func _update_background() -> void:
+
+func _enter_tree() -> void:
+    ProjectSettings.connect('settings_changed', on_setting_changed)
+
+
+func on_setting_changed():
+    var cb = $CheckButton
+    checkbutton_material = cb.material
+    apply_colors()
+
+
+func apply_colors():
     var is_light: bool = ProjectSettings.get_setting("application/config/Цвет темы программы", false)
     var style = get_theme_stylebox("read_only").duplicate()
     if is_light:
@@ -14,3 +21,8 @@ func _update_background() -> void:
     else:
         style.bg_color = Color(0.12, 0.12, 0.12)
     add_theme_stylebox_override("read_only", style)
+    var cb = $CheckButton
+    if is_light:
+        cb.material = null
+    else:
+        cb.material = checkbutton_material

table/settings-toggle.tscn

@@ -5,7 +5,7 @@
 
 [sub_resource type="StyleBoxEmpty" id="StyleBoxEmpty_il5wc"]
 
-[sub_resource type="ShaderMaterial" id="ShaderMaterial_xxfw6"]
+[sub_resource type="ShaderMaterial" id="ShaderMaterial_8lkgc"]
 shader = ExtResource("1_anyuq")
 
 [sub_resource type="StyleBoxEmpty" id="StyleBoxEmpty_8lkgc"]
@@ -25,7 +25,7 @@ deselect_on_focus_loss_enabled = false
 script = ExtResource("1_8lkgc")
 
 [node name="CheckButton" type="CheckButton" parent="."]
-material = SubResource("ShaderMaterial_xxfw6")
+material = SubResource("ShaderMaterial_8lkgc")
 layout_mode = 0
 offset_left = 453.0
 offset_top = 1.5

table/ячейка-2.gd

@@ -1,12 +1,11 @@
 extends LineEdit
 
-func _ready():
-    _update_background()
 
-func _process(_delta):
-    _update_background()
+func _enter_tree() -> void:
+    ProjectSettings.connect('settings_changed', apply_colors)
 
-func _update_background() -> void:
+
+func apply_colors():
     var is_light: bool = ProjectSettings.get_setting("application/config/Цвет темы программы", false)
     var style = get_theme_stylebox("normal").duplicate()
     var style_1 = get_theme_stylebox("read_only").duplicate()

table/ячейка-цвет.gd

@@ -1,12 +1,11 @@
 extends ColorPickerButton
 
-func _ready():
-    _update_background()
 
-func _process(_delta):
-    _update_background()
-    
-func _update_background() -> void:
+func _enter_tree() -> void:
+    ProjectSettings.connect('settings_changed', apply_colors)
+
+
+func apply_colors():
     var is_light: bool = ProjectSettings.get_setting("application/config/Цвет темы программы", false)
     var style = get_theme_stylebox("normal").duplicate()
     if is_light: