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, 3 insertions, 2 deletions

diff --git a/sway/commands/workspace.c b/sway/commands/workspace.c
index da597f8a..745b40c7 100644
--- a/sway/commands/workspace.c
+++ b/sway/commands/workspace.c
@@ -142,12 +142,13 @@ struct cmd_results *cmd_workspace(int argc, char **argv) {
                                 strcasecmp(argv[0], "current") == 0) {
                         ws = workspace_by_name(argv[0]);
                 } else if (strcasecmp(argv[0], "back_and_forth") == 0) {
-                        if (!prev_workspace_name) {
+                        struct sway_seat *seat = config->handler_context.seat;
+                        if (!seat->prev_workspace_name) {
                                 return cmd_results_new(CMD_INVALID, "workspace",
                                                 "There is no previous workspace");
                         }
                         if (!(ws = workspace_by_name(argv[0]))) {
-                                ws = workspace_create(NULL, prev_workspace_name);
+                                ws = workspace_create(NULL, seat->prev_workspace_name);
                         }
                 } else {
                         char *name = join_args(argv, argc);