Make workspace back_and_forth seat-specific

* When using multiple seats, each seat has its own prev_workspace_name
for the purpose of workspace back_and_forth.
* Removes prev_workspace_name global variable.
* Removes unused next_name_map function in tree/workspace.c.
* Fixes memory leak in seat_destroy (seat was not freed).

1 files changed, 1 insertions, 0 deletions

diff --git a/include/sway/input/seat.h b/include/sway/input/seat.h
index ef65810c..bef2af77 100644
--- a/include/sway/input/seat.h
+++ b/include/sway/input/seat.h
@@ -51,6 +51,7 @@ struct sway_seat {
         bool has_focus;
         struct wl_list focus_stack; // list of containers in focus order
         struct sway_workspace *workspace;
+        char *prev_workspace_name; // for workspace back_and_forth
 
         // If the focused layer is set, views cannot receive keyboard focus
         struct wlr_layer_surface_v1 *focused_layer;