(custom-push-theme): Maintain list of the settings
of a given theme in its theme-settings property. Maintain position of old settings in the theme-value or theme-face property. (custom-enabled-themes): New variable. (custom-theme-enabled-p): New function. (provide-theme): Update custom-enabled-themes. Disable and reenable the `user' theme. (require-theme): Doc fix. (custom-do-theme-reset, custom-remove-theme): Functions deleted. (custom-theme-value, custom-theme-variable-value): Likewise. (custom-theme-reset-internal): Likewise. (custom-theme-load-themes): Fix bugs and use custom-disable-theme. (custom-enable-theme, custom-disable-theme): New functions. (custom-variable-theme-value, custom-face-theme-value): Likewise. (custom-theme-recalc-variable, custom-theme-recalc-face): Likewise. (custom-theme-reset-variables): Simplify. (deftheme, custom-declare-theme, custom-make-theme-feature): Definitions moved.
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