executeDeccolm

Executes DECCOLM (CSI ? 3 h / CSI ? 3 l) as a core-owned macro command.

Valid widths are 80 and 132; all other values are ignored.

Sequence:

1. Resize both buffers to newWidth × currentHeight

2. Destructively clear the active display and its history

3. Home the active cursor to absolute (0, 0) regardless of DECOM

4. Reset active scroll margins to the full viewport

5. Reset active left/right margins to the full width

6. Reset tab stops to the default 8-column rhythm for the new width

7. Cancel pending wrap

8. Preserve both DECSC saved-cursor slots unchanged

When the alternate screen is active, DECCOLM follows the xterm-style policy used by resize: the alternate screen is wiped at the new width while the primary screen is reflowed in the background.

Parameters