Rebase the cursor after applying transactions

This approaches cursor rebasing from a different angle. Rather than
littering the codebase with cursor_rebase calls and using transaction
callbacks, this just runs cursor_rebase after applying every transaction
- but only if there's outputs connected, because otherwise it causes a
crash during shutdown.

There is one known case where we still need to call cursor_rebase
directly, and that's when running `seat seat0 cursor move ...`. This
command doesn't set anything as dirty so no transaction occurs.

include/sway/desktop/transaction.h

@@ -28,13 +28,6 @@ struct sway_view;
  */
 void transaction_commit_dirty(void);
 
-/**
- * Same as above, but runs the specific callback when the transaction is
- * applied.
- */
-void transaction_commit_dirty_with_callback(
-		void (*callback)(void *data), void *data);
-
 /**
  * Notify the transaction system that a view is ready for the new layout.
  *

sway/commands/border.c

@@ -94,10 +94,5 @@ struct cmd_results *cmd_border(int argc, char **argv) {
 
 	arrange_container(view->container);
 
-	struct sway_seat *seat = input_manager_current_seat();
-	if (seat->cursor) {
-		cursor_rebase(seat->cursor);
-	}
-
 	return cmd_results_new(CMD_SUCCESS, NULL, NULL);
 }

sway/commands/focus.c

@@ -236,7 +236,6 @@ struct cmd_results *cmd_focus(int argc, char **argv) {
 	if (argc == 0 && container) {
 		seat_set_focus_container(seat, container);
 		seat_consider_warp_to_focus(seat);
-		cursor_rebase(seat->cursor);
 		return cmd_results_new(CMD_SUCCESS, NULL, NULL);
 	}
 
@@ -294,7 +293,6 @@ struct cmd_results *cmd_focus(int argc, char **argv) {
 	if (next_focus) {
 		seat_set_focus(seat, next_focus);
 		seat_consider_warp_to_focus(seat);
-		cursor_rebase(seat->cursor);
 	}
 
 	return cmd_results_new(CMD_SUCCESS, NULL, NULL);

sway/desktop/transaction.c

@@ -11,6 +11,8 @@
 #include "sway/desktop.h"
 #include "sway/desktop/idle_inhibit_v1.h"
 #include "sway/desktop/transaction.h"
+#include "sway/input/cursor.h"
+#include "sway/input/input-manager.h"
 #include "sway/output.h"
 #include "sway/tree/container.h"
 #include "sway/tree/node.h"
@@ -25,8 +27,6 @@ struct sway_transaction {
 	size_t num_waiting;
 	size_t num_configures;
 	struct timespec commit_time;
-	void (*callback)(void *data);
-	void *callback_data;
 };
 
 struct sway_transaction_instruction {
@@ -298,8 +298,11 @@ static void transaction_apply(struct sway_transaction *transaction) {
 		node->instruction = NULL;
 	}
 
-	if (transaction->callback) {
-		transaction->callback(transaction->callback_data);
+	if (root->outputs->length) {
+		struct sway_seat *seat;
+		wl_list_for_each(seat, &server.input->seats, link) {
+			cursor_rebase(seat->cursor);
+		}
 	}
 }
 
@@ -505,7 +508,14 @@ void transaction_notify_view_ready_by_size(struct sway_view *view,
 	}
 }
 
-static void do_commit_dirty(struct sway_transaction *transaction) {
+void transaction_commit_dirty(void) {
+	if (!server.dirty_nodes->length) {
+		return;
+	}
+	struct sway_transaction *transaction = transaction_create();
+	if (!transaction) {
+		return;
+	}
 	for (int i = 0; i < server.dirty_nodes->length; ++i) {
 		struct sway_node *node = server.dirty_nodes->items[i];
 		transaction_add_node(transaction, node);
@@ -524,28 +534,3 @@ static void do_commit_dirty(struct sway_transaction *transaction) {
 		transaction_progress_queue();
 	}
 }
-
-void transaction_commit_dirty(void) {
-	if (!server.dirty_nodes->length) {
-		return;
-	}
-	struct sway_transaction *transaction = transaction_create();
-	if (!transaction) {
-		return;
-	}
-	do_commit_dirty(transaction);
-}
-
-void transaction_commit_dirty_with_callback(
-		void (*callback)(void *data), void *data) {
-	if (!server.dirty_nodes->length) {
-		return;
-	}
-	struct sway_transaction *transaction = transaction_create();
-	if (!transaction) {
-		return;
-	}
-	transaction->callback = callback;
-	transaction->callback_data = data;
-	do_commit_dirty(transaction);
-}

sway/desktop/xdg_shell.c

@@ -397,11 +397,6 @@ static void handle_unmap(struct wl_listener *listener, void *data) {
 	wl_list_remove(&xdg_shell_view->set_app_id.link);
 }
 
-static void do_rebase(void *data) {
-	struct sway_cursor *cursor = data;
-	cursor_rebase(cursor);
-}
-
 static void handle_map(struct wl_listener *listener, void *data) {
 	struct sway_xdg_shell_view *xdg_shell_view =
 		wl_container_of(listener, xdg_shell_view, map);
@@ -428,8 +423,7 @@ static void handle_map(struct wl_listener *listener, void *data) {
 	view_map(view, view->wlr_xdg_surface->surface,
 		xdg_surface->toplevel->client_pending.fullscreen, csd);
 
-	struct sway_seat *seat = input_manager_current_seat();
-	transaction_commit_dirty_with_callback(do_rebase, seat->cursor);
+	transaction_commit_dirty();
 
 	xdg_shell_view->commit.notify = handle_commit;
 	wl_signal_add(&xdg_surface->surface->events.commit,

sway/desktop/xdg_shell_v6.c

@@ -394,11 +394,6 @@ static void handle_unmap(struct wl_listener *listener, void *data) {
 	wl_list_remove(&xdg_shell_v6_view->set_app_id.link);
 }
 
-static void do_rebase(void *data) {
-	struct sway_cursor *cursor = data;
-	cursor_rebase(cursor);
-}
-
 static void handle_map(struct wl_listener *listener, void *data) {
 	struct sway_xdg_shell_v6_view *xdg_shell_v6_view =
 		wl_container_of(listener, xdg_shell_v6_view, map);
@@ -419,8 +414,7 @@ static void handle_map(struct wl_listener *listener, void *data) {
 	view_map(view, view->wlr_xdg_surface_v6->surface,
 		xdg_surface->toplevel->client_pending.fullscreen, csd);
 
-	struct sway_seat *seat = input_manager_current_seat();
-	transaction_commit_dirty_with_callback(do_rebase, seat->cursor);
+	transaction_commit_dirty();
 
 	xdg_shell_v6_view->commit.notify = handle_commit;
 	wl_signal_add(&xdg_surface->surface->events.commit,

sway/desktop/xwayland.c

@@ -391,11 +391,6 @@ static void handle_unmap(struct wl_listener *listener, void *data) {
 	wl_list_remove(&xwayland_view->commit.link);
 }
 
-static void do_rebase(void *data) {
-	struct sway_cursor *cursor = data;
-	cursor_rebase(cursor);
-}
-
 static void handle_map(struct wl_listener *listener, void *data) {
 	struct sway_xwayland_view *xwayland_view =
 		wl_container_of(listener, xwayland_view, map);
@@ -422,8 +417,7 @@ static void handle_map(struct wl_listener *listener, void *data) {
 	// Put it back into the tree
 	view_map(view, xsurface->surface, xsurface->fullscreen, false);
 
-	struct sway_seat *seat = input_manager_current_seat();
-	transaction_commit_dirty_with_callback(do_rebase, seat->cursor);
+	transaction_commit_dirty();
 }
 
 static void handle_request_configure(struct wl_listener *listener, void *data) {

sway/input/seat.c

@@ -1196,5 +1196,4 @@ void seat_consider_warp_to_focus(struct sway_seat *seat) {
 	} else {
 		cursor_warp_to_workspace(seat->cursor, focus->sway_workspace);
 	}
-	cursor_rebase(seat->cursor);
 }

sway/tree/view.c

@@ -661,7 +661,6 @@ void view_unmap(struct sway_view *view) {
 				cursor_warp_to_workspace(seat->cursor, node->sway_workspace);
 			}
 		}
-		cursor_rebase(seat->cursor);
 	}
 
 	transaction_commit_dirty();

sway/tree/workspace.c

@@ -404,7 +404,6 @@ bool workspace_switch(struct sway_workspace *workspace,
 	}
 	seat_set_focus(seat, next);
 	arrange_workspace(workspace);
-	cursor_rebase(seat->cursor);
 	return true;
 }