Fix m3u-prune scriptlet

Related issue:
- https://www.reddit.com/r/uBlockOrigin/comments/14cbznu/foxcom_ssai_workaround/

assets/resources/scriptlets.js

@@ -2311,13 +2311,21 @@ function xmlPrune(
 builtinScriptlets.push({
  name: 'm3u-prune.js',
  fn: m3uPrune,
+ dependencies: [
+ 'get-extra-args.fn',
+ 'safe-self.fn',
+ 'should-log.fn',
+ ],
 });
 // https://en.wikipedia.org/wiki/M3U
 function m3uPrune(
  m3uPattern = '',
  urlPattern = ''
 ) {
  if ( typeof m3uPattern !== 'string' ) { return; }
+ const options = getExtraArgs(Array.from(arguments), 2);
+ const logLevel = shouldLog(options);
+ const safe = safeSelf();
  const regexFromArg = arg => {
  if ( arg === '' ) { return /^/; }
  const match = /^\/(.+)\/([gms]*)$/.exec(arg);
@@ -2367,16 +2375,39 @@ function m3uPrune(
  for (;;) {
  const match = reM3u.exec(text);
  if ( match === null ) { break; }
- const before = text.slice(0, match.index);
- if ( before.length === 0 || /[\n\r]+\s*$/.test(before) ) {
- const after = text.slice(match.index + match[0].length);
- if ( after.length === 0 || /^\s*[\n\r]+/.test(after) ) {
- text = before.trim() + '\n' + after.trim();
- reM3u.lastIndex = before.length + 1;
+ let discard = match[0];
+ let before = text.slice(0, match.index);
+ if (
+ /^[\n\r]+/.test(discard) === false &&
+ /[\n\r]+$/.test(before) === false
+ ) {
+ const startOfLine = /[^\n\r]+$/.exec(before);
+ if ( startOfLine !== null ) {
+ before = before.slice(0, startOfLine.index);
+ discard = startOfLine[0] + discard;
+ }
+ }
+ let after = text.slice(match.index + match[0].length);
+ if (
+ /[\n\r]+$/.test(discard) === false &&
+ /^[\n\r]+/.test(after) === false
+ ) {
+ const endOfLine = /^[^\n\r]+/.exec(after);
+ if ( endOfLine !== null ) {
+ after = after.slice(endOfLine.index);
+ discard += discard + endOfLine[0];
  }
  }
+ text = before.trim() + '\n' + after.trim();
+ reM3u.lastIndex = before.length + 1;
+ if ( logLevel ) {
+ safe.uboLog('m3u-prune: discarding\n',
+ discard.split(/\n+/).map(s => `\t${s}`).join('\n')
+ );
+ }
  if ( reM3u.global === false ) { break; }
  }
+ return text;
  }
  const lines = text.split(/\n\r|\n|\r/);
  for ( let i = 0; i < lines.length; i++ ) {