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ShrinkVertically/Asset/css/shrink-vertically.css

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CSS

/*
* ShrinkVertically -- keep the board's horizontal scrollbar visible when columns
* are vertically collapsed (gear menu "collapse vertically" / shortcut, which sets
* localStorage vertical_scroll=0 and adds the class .board-task-list-compact).
*
* Kanboard core sets: .board-task-list-compact { max-height: 90vh; }
* That 90vh is measured from the top of the viewport and ignores the page header
* above the board, so column + header together exceed the viewport and push the
* horizontal scrollbar below the fold.
*
* We instead reserve a fixed pixel budget for the chrome above and below the task
* list (page header + board column header + the horizontal scrollbar + a little
* breathing room). A fixed-px budget is more reliable than a proportional vh value
* because that chrome is a fixed height regardless of screen size.
*
* Tune the single number below (240px) if the scrollbar is still clipped or if you
* want the columns taller.
*
* The selector is intentionally more specific than core's single-class rule, and
* uses !important, so this override wins even alongside a theme (e.g. Essential).
*
* The min-height override is essential: Kanboard's drag-and-drop sets an INLINE
* min-height on each column equal to its full content height
* (BoardDragAndDrop.js: css("min-height", parent().height())). In CSS, min-height
* beats max-height, so that inline value keeps tall columns from shrinking and our
* max-height alone does nothing. A stylesheet !important overrides the inline
* (non-important) min-height, so we reset it to 0 and let max-height win.
*/
#board td .board-task-list.board-task-list-compact {
max-height: calc(100vh - 240px) !important;
min-height: 0 !important;
}