Method isInSelection

lib/renderer.ts:903–927

* Check if a cell at (x, y) is within the current selection. * Uses cached selection coordinates for performance.

(x: number, y: number)

   * Uses cached selection coordinates for performance.
   */
  private isInSelection(x: number, y: number): boolean {
    const sel = this.currentSelectionCoords;
    if (!sel) return false;

    const { startCol, startRow, endCol, endRow } = sel;

    // Single line selection
    if (startRow === endRow) {
      return y === startRow && x >= startCol && x <= endCol;
    }

    // Multi-line selection
    if (y === startRow) {
      // First line: from startCol to end of line
      return x >= startCol;
    } else if (y === endRow) {
      // Last line: from start of line to endCol
      return x <= endCol;
    } else if (y > startRow && y < endRow) {
      // Middle lines: entire line is selected
      return true;
    }

    return false;
  }

  /**
   * Set the currently hovered hyperlink ID for rendering underlines