Move template_preprocess, _template_preprocess_default_variables into services

Created on 17 September 2014, over 10 years ago

Updated 2 July 2024, 6 months ago

Problem/Motivation

Coming from #2325571-7: Replace _theme() calls by calls to \Drupal::theme()->render() → @alexpott suggested moving template_preprocess and _template_preprocess_default_variables into one of the Theme services. @dawehner created this issue as a follow up with original title: 'Move template_preprocess, _template_preprocess_default_variables into services (Probably ThemeManager or invoked via that.)'

Proposed resolution

Move template_preprocess() and _template_preprocess_default_variables() to ThemeManager class.

Remaining tasks

Make reviews
Decide if we need to deprecate theme_preprocess() or can we simply remove it

User interface changes

None.

API changes

theme_preprocess() should be removed. I think nobody should use theme_preprocess() anywhere in contrib. Other option is to deprecate it. This need to be decided before merging this in.