Function sliceSpans

sliceSpans(spans: readonly MarkdownSpan[], count: number): MarkdownSpan[]
The first count visible characters across already-parsed spans, styles kept - the progressive-reveal slice for RichLabel, where markers must never count toward the total nor leak onto screen half-shown. Counts in string characters, the same unit String.slice (and MessageBox's own reveal) uses.
Parameters
- spans: readonly MarkdownSpan[]
- count: number
Returns MarkdownSpan[]
Example
```
import { parseMarkdown, sliceSpans } from '@datamoc/mw_games/two-d/ui';

sliceSpans(parseMarkdown('Take **two** coins'), 7);
// [{ text: 'Take ', bold: false, italic: false },
//  { text: 'tw', bold: true, italic: false }]
```
- Defined in src/two-d/ui/markdown.ts:194