a368a90e37
Previously, body drops in all non-Splits layouts showed a full-window overlay
and performed a positional swap. This adds proper top/bottom or left/right
half-window overlays and true before/after insertion for the five layouts
Kovid identified.
Architecture:
- New `drag_overlay_mode` ClassVar on Layout ('full'|'axis_y'|'axis_x'|'free')
controls both overlay display and valid direction axis. Layout subclasses set
one line; tabs.py and boss.py dispatch on this attribute instead of hasattr.
- New `insert_window_group_next_to(target_group_id, after)` on WindowList
performs a positional insert (not swap) by popping the active group and
inserting it before or after the target.
- New base `insert_window_next_to` on Layout uses insert_window_group_next_to
for axis_x/axis_y layouts and falls back to swap for 'full' (Stack).
Splits overrides this with its existing tree-based implementation.
- `_insert_window_in_direction` in boss.py collapses from a 7-line hasattr
branch to a single layout.insert_window_next_to() call.
Direction constraints:
Vertical, Tall, Grid -> top/bottom (axis_y)
Horizontal, Fat -> left/right (axis_x)
Splits -> 4-way free (unchanged)
Stack -> full-window swap (unchanged)
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