Theme variables/resources heritage

[Numbered]

Hi IPS. This idea - improvement for parent / children themes.

We have this themes heritage:

• 4.2 - Default Theme
  • Example - Theme With HTML Templates, Default Resources and Custom Theme variables
    • Theme_1 - theme, where we do some coloring for a structure in Example
    • Theme_2 - theme, where we redefine some resources, which replace default resources from Example. For example, background image for body
    • Theme_3 - theme, where we redefine some variables

Problems:

• we want remove rosource jpg file from Theme_2 and Theme_3 and get this image from parent Example theme. Now if we remove resource - it can't load by {resource='back.jpg'...} from Example
• we want to change some global color in Example theme with variable - we can't do it, if we not define or remove this variable from children theme {theme="some_color"} - didn't load it from Example

Will be perfect, if theme varibales and resources will load from parent, if in child theme it not defined.

Thanks!