Method setSelectionBgColor

src/ink/ink.tsx:1284–1302

* Set the selection highlight background color. Replaces the per-cell * SGR-7 inverse with a solid theme-aware bg (matches native terminal * selection). Accepts the same color formats as Text backgroundColor * (rgb(), ansi:name, #hex, ansi256()) — colorize() routes through * chalk so the

(color: string)

   * unobservable in practice.
   */
  setSelectionBgColor(color: string): void {
    // Wrap a NUL marker, then split on it to extract the open/close SGR.
    // colorize returns the input unchanged if the color string is bad —
    // no NUL-split then, so fall through to null (inverse fallback).
    const wrapped = colorize('\0', color, 'background');
    const nul = wrapped.indexOf('\0');
    if (nul <= 0 || nul === wrapped.length - 1) {
      this.stylePool.setSelectionBg(null);
      return;
    }
    this.stylePool.setSelectionBg({
      type: 'ansi',
      code: wrapped.slice(0, nul),
      endCode: wrapped.slice(nul + 1) // always \x1b[49m for bg
    });
    // No scheduleRender: this is called from a React effect that already
    // runs inside the render cycle, and the bg only matters once a
    // selection exists (which itself triggers a full-damage frame).
  }

  /**
   * Capture text from rows about to scroll out of the viewport during