v5: Forms update (#28450)

* Initial spike of consolidated form checks

* Stub out forms rearrangement

- Prepping to drop non-custom file and range inputs
- Prepping to merge custom and native checks and radios (with switches)
- Prepping to merge custom select with form select
- Moving docs arround so forms has it's own area given volume of CSS

* Move input group Sass file to forms subdir

* Start to split and move the docs around

* Simpler imports

* Copyediting

* delete overview file

* Remove commented out code

* remove the custom-forms import

* rewrite flex-check as form-check, replace all custom properties

* Remove old forms doc

* stub out new subpage link section

* update migration guide

* Update nav, forms overview in page nav, and descriptions

* fix check bg position

* fix margin-top calculation

* rename .custom-select to .form-select

* Update validation styles for new checks

* add some vertical margin, fix inline checks

* fix docs examples

* better way to do this contents stuff, redo the toc while i'm at it

* page restyle for docs while here

* un-callout that, edit text

* redo padding on toc

* fix toc

* start to cleanup checks docs

* Rewrite Markdown tables into HTML

* Redesign tables, redo their docs

* Replace Open Iconic icons with custom Bootstrap icons

* Redesign the docs navbar, add a subheader, redo the sidebar

* Redesign docs homepage a bit

* Simplify table style overrides for docs tables

* Simplify docs typography for page titles and reading line length

* Stub out icons page

* Part of sidebar update, remove migration from nav.yml

* Move toc CSS to separate partial

* Change appearance of overview page

* fix sidebar arrow direction

* Add footer to docs layout

* Update descriptions

* Drop the .form-group class for margin utilities

* Remove lingering form-group-margin-bottom var

* improve footer spacing

* add headings to range page

* uncomment form range css

* Rename .custom-range to .form-range

* Drop unused docs var

* Uncomment the comment

* Remove unused variable

* Fix radio image sizing

* Reboot update: reset horizontal ul and ol padding

* de-dupe IDs

* tweak toc styles

* nvm, fix dropdown versions stuff

* remove sidebar nav toggle for now

* broken html

* fix more broken html, move css

* scss linting

* comment out broken helper docs

* scope styles

* scope styles

* Fixes #25540 and fixes #26407 for v5 only

* Update sidebar once more

* Match new sidenav order

* fix syntax error

* Rename custom-file to form-file, update paths, update migration docs for previous changes in #28696

* rename back

* fix size and alignment

* rename that back too

site/content/docs/4.3/migration.md

@@ -53,16 +53,25 @@ Changes to any layout tools and our grid system.
 Changes to Reboot, typography, tables, and more.
 
 - **Todo:** Make RFS enabled by default
+- Reset default horizontal `padding` on `<ul>` and `<ol>` elements from browser default `40px` to `2rem`.
 
 ## Forms
 
-- Dropped support for `.form-control-plaintext` inside `.input-group`
-- **Todo:** Move forms documentation to it's own top-level section
-- **Todo:** Rearrange source Sass files (under `scss/forms/`)
-- **Todo:** Combine native and custom checkboxes and radios
-- **Todo:** Rewrite checks to support sizing (via `em`/`font-size` or explicit modifier classes)
-- **Todo:** Combine native and custom selects
-- **Todo:** Combine native and custom file and range inputs
+- Rearranged form documentation under its own top-level section.
+  - Split out old Forms page into several subpages
+  - Moved input groups docs under new Forms section
+- Rearranged source Sass files under `scss/forms/`, including moving over input group styles.
+- Combined native and custom checkboxes and radios into single `.form-check` class.
+  - New checks support sizing via `em`/`font-size` or explicit modifier classes now.
+  - Dropped `.custom-control` and associated classes.
+- Combined native and custom selects into `.form-select`.
+  - Dropped `.custom-select` and associated classes.
+- Dropped native `.form-control-file` and `.form-control-range` components.
+- Renamed `.custom-file` to `.form-file` (including variables).
+- Refactored `.form-file` markup to resolve some visual bugs while allowing translation and button text changes via HTML instead of CSS.
+- Renamed `.custom-range` to `.form-range` (including variables).
+- Dropped `.form-group` for margin utilities (we've replaced our docs examples with `.mb-3`).
+- Dropped support for `.form-control-plaintext` inside `.input-group`s.
 
 ## Components