Proposal: helper to track surface damage

[emersion]

struct wlr_surface_damage_manager {
	struct wlr_surface *surface;
	struct {
		struct wl_signal damage;
	} events;
};

struct wlr_surface_damage_manager_damage_event {
	struct wlr_surface_damage_manager *manager;
	int32_t sx, sy;
	pixman_region32_t *damage;
};

// Listens to surface commit and damage from children subsurfaces.
struct wlr_surface_damage_manager *wlr_surface_damage_manager_from_surface(
	struct wlr_surface *surface);
// Listens to surface commit, map/unmap and damage from children
// subsurfaces/popups.
struct wlr_surface_damage_manager *wlr_surface_damage_manager_from_xdg_surface(
	struct wlr_xdg_surface *xdg_surface);

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wlroots has migrated to gitlab.freedesktop.org. This issue has been moved to:

https://gitlab.freedesktop.org/wlroots/wlroots/-/issues/1543