Fix dark theme issue in DOM inspector

Related issue:
- https://github.com/uBlockOrigin/uBlock-issues/issues/2196

src/js/scriptlets/dom-inspector.js

@@ -41,100 +41,6 @@ if ( document.querySelector('iframe.dom-inspector.' + sessionId) !== null ) {
 /******************************************************************************/
 /******************************************************************************/
 
-// Modified to avoid installing as a global shim -- so the scriptlet can be
-// flushed from memory once no longer in use.
-
-// Added serializeAsString parameter.
-
-/*! http://mths.be/cssescape v0.2.1 by @mathias | MIT license */
-const cssEscape = (function(/*root*/) {
-
-    var InvalidCharacterError = function(message) {
-        this.message = message;
-    };
-    InvalidCharacterError.prototype = new Error();
-    InvalidCharacterError.prototype.name = 'InvalidCharacterError';
-
-    // http://dev.w3.org/csswg/cssom/#serialize-an-identifier
-    return function(value, serializeAsString) {
-        var string = String(value);
-        var length = string.length;
-        var index = -1;
-        var codeUnit;
-        var result = '';
-        var firstCodeUnit = string.charCodeAt(0);
-        while (++index < length) {
-            codeUnit = string.charCodeAt(index);
-            // Note: there’s no need to special-case astral symbols, surrogate
-            // pairs, or lone surrogates.
-
-            // If the character is NULL (U+0000), then throw an
-            // `InvalidCharacterError` exception and terminate these steps.
-            if (codeUnit === 0x0000) {
-                throw new InvalidCharacterError(
-                    'Invalid character: the input contains U+0000.'
-                );
-            }
-
-            if (
-                // If the character is in the range [\1-\1F] (U+0001 to U+001F) or is
-                // U+007F, […]
-                (codeUnit >= 0x0001 && codeUnit <= 0x001F) || codeUnit === 0x007F ||
-                // If the character is the first character and is in the range [0-9]
-                // (U+0030 to U+0039), […]
-                (index === 0 && codeUnit >= 0x0030 && codeUnit <= 0x0039) ||
-                // If the character is the second character and is in the range [0-9]
-                // (U+0030 to U+0039) and the first character is a `-` (U+002D), […]
-                (
-                    index === 1 &&
-                    codeUnit >= 0x0030 && codeUnit <= 0x0039 &&
-                    firstCodeUnit === 0x002D
-                )
-            ) {
-                // http://dev.w3.org/csswg/cssom/#escape-a-character-as-code-point
-                result += '\\' + codeUnit.toString(16) + ' ';
-                continue;
-            }
-
-            // If the character is not handled by one of the above rules and is
-            // greater than or equal to U+0080, is `-` (U+002D) or `_` (U+005F), or
-            // is in one of the ranges [0-9] (U+0030 to U+0039), [A-Z] (U+0041 to
-            // U+005A), or [a-z] (U+0061 to U+007A), […]
-            if (
-                codeUnit >= 0x0080 ||
-                codeUnit === 0x002D ||
-                codeUnit === 0x005F ||
-                codeUnit >= 0x0030 && codeUnit <= 0x0039 ||
-                codeUnit >= 0x0041 && codeUnit <= 0x005A ||
-                codeUnit >= 0x0061 && codeUnit <= 0x007A
-            ) {
-                // the character itself
-                result += string.charAt(index);
-                continue;
-            }
-
-            // If "serialize a string":
-            // If the character is '"' (U+0022) or "\" (U+005C), the escaped
-            // character. Otherwise, the character itself.
-            // http://dev.w3.org/csswg/cssom/#serialize-a-string
-            if ( serializeAsString && codeUnit !== 0x0022 && codeUnit !== 0x005C ) {
-                // the character itself
-                result += string.charAt(index);
-                continue;
-            }
-
-            // Otherwise, the escaped character.
-            // http://dev.w3.org/csswg/cssom/#escape-a-character
-            result += '\\' + string.charAt(index);
-
-        }
-        return result;
-    };
-}(self));
-
-/******************************************************************************/
-/******************************************************************************/
-
 let loggerConnectionId;
 
 // Highlighter-related
@@ -177,19 +83,19 @@ const domLayout = (function() {
     const selectorFromNode = function(node) {
         var str, attr, pos, sw, i;
         var tag = node.localName;
-        var selector = cssEscape(tag);
+        var selector = CSS.escape(tag);
         // Id
         if ( typeof node.id === 'string' ) {
             str = node.id.trim();
             if ( str !== '' ) {
-                selector += '#' + cssEscape(str);
+                selector += '#' + CSS.escape(str);
             }
         }
         // Class
         var cl = node.classList;
         if ( cl ) {
             for ( i = 0; i < cl.length; i++ ) {
-                selector += '.' + cssEscape(cl[i]);
+                selector += '.' + CSS.escape(cl[i]);
             }
         }
         // Tag-specific attributes
@@ -209,7 +115,7 @@ const domLayout = (function() {
                 sw = '';
             }
             if ( str !== '' ) {
-                selector += '[' + attr + sw + '="' + cssEscape(str, true) + '"]';
+                selector += '[' + attr + sw + '="' + CSS.escape(str, true) + '"]';
             }
         }
         return selector;
@@ -949,6 +855,7 @@ pickerRoot.style.cssText = [
     'border: 0',
     'border-radius: 0',
     'box-shadow: none',
+    'color-scheme: light',
     'display: block',
     'height: 100%',
     'left: 0',