display: snap monitors to aligned centers in the arrangement view - #384
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ggiesen wants to merge 1 commit into
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display: snap monitors to aligned centers in the arrangement view#384ggiesen wants to merge 1 commit into
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When dragging a monitor in the Display arrangement panel, also offer snap positions that align the dragged monitor's center with an adjacent monitor's center -- both stacked (top/bottom) and side by side (left/right). Until now only edges snapped, so two monitors of different sizes could not be centered relative to each other by dragging, even though muffin accepts the resulting centered-but-abutting layout as valid. This adds four center-aligned candidates in find_best_snapping(), alongside the existing edge candidates. The stacked (horizontal-center) case matches the approach gnome-control-center took; the side-by-side (vertical-center) case extends the same idea to the vertical axis.
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What
In the Display arrangement panel, dragging a monitor now also snaps to positions that align its center with an adjacent monitor's center -- both stacked (top/bottom) and side by side (left/right) -- alongside the existing edge snaps.
Why
Currently only edges snap, so two monitors of different sizes cannot be centered relative to each other by dragging; you can only line up their top/bottom or left/right edges. A centered-but-abutting arrangement is a valid layout (muffin accepts it), so this is a UI-only gap.
How
Four center-aligned candidates are added in
find_best_snapping()(panels/display/cc-display-arrangement.c) asSNAP_DIR_BOTHpeers of the existing edge candidates:Prior art
GNOME's gnome-control-center added the stacked (horizontal-edge) center-snap in commit
3070866d("display-arrangement: Add center-aligned snapping for horizontal edges", 2026-06-22). This brings that case to Cinnamon and additionally adds the side-by-side (vertical-edge) center case, which GNOME does not have.Testing
Built and drag-tested on Linux Mint 22 (Cinnamon, X11): a smaller monitor now snaps to vertically-centered when placed beside a larger one, and horizontally-centered when stacked, in addition to the edge snaps. No backend change required.