Implement pid->workspace tracking

When you spawn a process with the exec command, sway now notes the
workspace you had focused and the pid of the child process, then assigns
that workspace to the child when its window appears.

Some of this is carried over from sway 0.15, but with some major
refactoring and centralization of state.

1 files changed, 34 insertions, 9 deletions

diff --git a/sway/tree/view.c b/sway/tree/view.c
index 06e9edc5..24fb6864 100644
--- a/sway/tree/view.c
+++ b/sway/tree/view.c
@@ -3,6 +3,7 @@
 #include <wayland-server.h>
 #include <wlr/render/wlr_renderer.h>
 #include <wlr/types/wlr_output_layout.h>
+#include <wlr/xwayland.h>
 #include "list.h"
 #include "log.h"
 #include "sway/criteria.h"
@@ -492,9 +493,21 @@ void view_map(struct sway_view *view, struct wlr_surface *wlr_surface) {
 		return;
 	}
 
+	pid_t pid;
+	if (view->type == SWAY_VIEW_XWAYLAND) {
+		struct wlr_xwayland_surface *surf =
+			wlr_xwayland_surface_from_wlr_surface(wlr_surface);
+		pid = surf->pid;
+	} else {
+		struct wl_client *client =
+			wl_resource_get_client(wlr_surface->resource);
+		wl_client_get_credentials(client, &pid, NULL, NULL);
+	}
+
 	struct sway_seat *seat = input_manager_current_seat(input_manager);
-	struct sway_container *focus =
+	struct sway_container *target_sibling =
 		seat_get_focus_inactive(seat, &root_container);
+	struct sway_container *prev_focus = target_sibling;
 	struct sway_container *cont = NULL;
 
 	// Check if there's any `assign` criteria for the view
@@ -508,18 +521,31 @@ void view_map(struct sway_view *view, struct wlr_surface *wlr_surface) {
 			if (!workspace) {
 				workspace = workspace_create(NULL, criteria->target);
 			}
-			focus = seat_get_focus_inactive(seat, workspace);
+			prev_focus = target_sibling;
+			target_sibling = seat_get_focus_inactive(seat, workspace);
 		} else {
 			// TODO: CT_ASSIGN_OUTPUT
 		}
 	}
+	list_free(criterias);
+
+	if (!workspace) {
+		workspace = workspace_for_pid(pid);
+		if (workspace) {
+			prev_focus = target_sibling;
+			target_sibling = seat_get_focus_inactive(seat, workspace);
+		}
+	}
 	// If we're about to launch the view into the floating container, then
 	// launch it as a tiled view in the root of the workspace instead.
-	if (container_is_floating(focus)) {
-		focus = focus->parent->parent;
+	if (container_is_floating(target_sibling)) {
+		if (prev_focus == target_sibling) {
+			prev_focus = target_sibling->parent->parent;
+		}
+		target_sibling = target_sibling->parent->parent;
 	}
-	free(criterias);
-	cont = container_view_create(focus, view);
+
+	cont = container_view_create(target_sibling, view);
 
 	view->surface = wlr_surface;
 	view->swayc = cont;
@@ -538,9 +564,8 @@ void view_map(struct sway_view *view, struct wlr_surface *wlr_surface) {
 		container_set_floating(view->swayc, true);
 	}
 
-	input_manager_set_focus(input_manager, cont);
-	if (workspace) {
-		workspace_switch(workspace);
+	if (prev_focus == target_sibling) {
+		input_manager_set_focus(input_manager, cont);
 	}
 
 	view_update_title(view, false);