Method normalizeSelection

lib/selection-manager.ts:772–808

* Normalize selection coordinates (handle backward selection) * Returns coordinates in VIEWPORT space for rendering, clamped to visible area

()

   * Returns coordinates in VIEWPORT space for rendering, clamped to visible area
   */
  private normalizeSelection(): SelectionCoordinates | null {
    if (!this.selectionStart || !this.selectionEnd) return null;

    let { col: startCol, absoluteRow: startAbsRow } = this.selectionStart;
    let { col: endCol, absoluteRow: endAbsRow } = this.selectionEnd;

    // Swap if selection goes backwards
    if (startAbsRow > endAbsRow || (startAbsRow === endAbsRow && startCol > endCol)) {
      [startCol, endCol] = [endCol, startCol];
      [startAbsRow, endAbsRow] = [endAbsRow, startAbsRow];
    }

    // Convert to viewport coordinates
    let startRow = this.absoluteRowToViewport(startAbsRow);
    let endRow = this.absoluteRowToViewport(endAbsRow);

    // Clamp to visible viewport range
    const dims = this.wasmTerm.getDimensions();
    const maxRow = dims.rows - 1;

    // If entire selection is outside viewport, return null
    if (endRow < 0 || startRow > maxRow) {
      return null;
    }

    // Clamp rows to visible range, adjusting columns for partial rows
    if (startRow < 0) {
      startRow = 0;
      startCol = 0; // Selection starts from beginning of first visible row
    }
    if (endRow > maxRow) {
      endRow = maxRow;
      endCol = dims.cols - 1; // Selection extends to end of last visible row
    }

    return { startCol, startRow, endCol, endRow };
  }

  /**
   * Get word boundaries at a cell position