79b016d915
The short explanation is that Drupal uses a lot of numeric deltas in the block system; blocks are identified by the 'module' and the 'delta'. In early Drupal, delta was numeric, but somewhere along the line it was changed to be possibly a string. In modern Drupal, block overrides are easily done via block-MODULE-DELTA.tpl.php. The primary motivation to switch to string IDs everywhere is to make these deltas friendlier to themers:
block-user-0.tpl.php --> block-user-navigation.tpl.php
block-user-1.tpl.php --> block-user-login.tpl.php
You get the picture.
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| .. | ||
| user-picture.tpl.php | ||
| user-profile-category.tpl.php | ||
| user-profile-item.tpl.php | ||
| user-profile.tpl.php | ||
| user-rtl.css | ||
| user.admin.inc | ||
| user.css | ||
| user.info | ||
| user.install | ||
| user.js | ||
| user.module | ||
| user.pages.inc | ||