Eruda Incompatipatch - Makes Eruda functional in Servo. #45892

https://github.com/thesepeoplearenotyourfriends/servo-eruda-incompatipatch

/*

• Servo Incompatipatch — self-booting Eruda host
• v0.2 + field addendums
• A page only needs:
• <script src="./incompatipatch-eruda.js"></script>
• This file turns a stock local Eruda bundle into a Servo-friendly
• local dev console. It owns the complete lifecycle:
• 1. preflight

•  - tests localStorage/sessionStorage
  

•  - installs enumerable RAM Storage fallbacks only when opaque
  

•    file: origins cause native storage to throw
  

• 1. load

•  - dynamically loads CONFIG.eruda_source
  

•  - starts Eruda with configured theme and display size
  

•  - keeps the page-side installation to one script tag
  

• 1. postflight

•  - repairs Eruda's unsupported `pointer-events: all` usage
  

•  - watches later-created Eruda UI with MutationObserver
  

•  - installs control and console compatibility addendums
  

• Included incompatipatches

• ---

• IP-001 — native control fallbacks
• • replaces dead behavior with a custom DOM slider
• • supports click, drag, keyboard stepping, Home/End, PageUp/PageDown
• • writes back to the original input and emits normal input/change events
• • replaces dead single-select popups with a custom DOM listbox
• • preserves the original select.value / selectedIndex contract
• • dispatches normal input/change events for existing Eruda listeners
• • opens select menus upward when lower viewport space is insufficient
• • optionally marks patched controls with red diagnostic outlines
• IP-002 — console execution ergonomics
• • Ctrl+Enter / Cmd+Enter triggers Eruda's real Execute path
• • avoids dependence on Eruda's hidden/broken native action rail
• IP-003 — Storage inspector bridge
• • works around Eruda Resources using JSON.stringify(storage)
• • enumerates native Servo Storage honestly through:

•   storage.length → storage.key(i) → storage.getItem(key)
  

• • makes ordinary app keys visible in Resources / Local Storage
• • can optionally reveal Eruda's own hidden eruda-* settings keys
• IP-004 — console history and completion
• • ArrowUp / ArrowDown session command history at textarea edges
• • preserves ordinary multiline arrow behavior away from those edges
• • Tab completion for safe identifier/property chains
• • Shift+Tab cycles candidates backward
• • completion avoids eval: no calls, operators, bracket expressions,

• or arbitrary source execution
  

• IP-005 — selected-log copy shortcut
• • Ctrl+C / Cmd+C activates Eruda's enabled Copy control when a

• structured console log is selected
  

• • never steals normal copy from textarea, input, contenteditable,

• or an ordinary document text selection
  

• IP-006 — legacy copy to modern clipboard bridge
• • Eruda/Licia uses document.execCommand("copy")
• • Servo reports legacy copy unsupported even though modern Clipboard API

• exists and navigator.clipboard.writeText() works
  

• • intercepts legacy copy only
• • reads Eruda/Licia's temporary offscreen copy textarea
• • routes its actual text through navigator.clipboard.writeText()
• • restores working toolbar Copy and selected-log Ctrl+C copying
• Known engine gaps still visible

• ---

• • CSS user-select is unsupported, so ordinary mouse drag selection in

• rendered console text remains an engine issue.
  

• • text-overflow, resize, appearance, forced-colors and related CSS

• declarations may be ignored by current Servo builds.
  

• • native and behavior is supplied here

• as a temporary JavaScript prosthetic, not considered permanently fixed.
  

• • malformed table-like HTML may trigger html5ever's current

• "foster parenting not implemented" warning.
  

*/