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xwayland: handle unset _NET_WM_NAME

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The spec says [1]:

> If set, the Window Manager should use this in preference to WM_NAME.

However we overwrite WM_NAME with NULL when _NET_WM_NAME is unset.
Fix this by storing both WM_NAME and _NET_WM_NAME, so that we
handle properly all combinations of events (e.g. a client setting
both and later clearing one).

[1]: https://specifications.freedesktop.org/wm-spec/1.3/ar01s05.html#id-1.6.2
This commit is contained in:
Simon Ser 2025-05-01 15:11:36 +02:00
parent 2420bfef0b
commit af34aaad53
2 changed files with 28 additions and 12 deletions
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38
xwayland/xwm.c
View file

@ -629,7 +629,8 @@ static void xwayland_surface_destroy(struct wlr_xwayland_surface *xsurface) {
wl_event_source_remove(xsurface->ping_timer);
free(xsurface->title);
free(xsurface->wm_name);
free(xsurface->net_wm_name);
free(xsurface->class);
free(xsurface->instance);
free(xsurface->role);
@ -739,7 +740,7 @@ static void read_surface_role(struct wlr_xwm *xwm,
}
static void read_surface_title(struct wlr_xwm *xwm,
struct wlr_xwayland_surface *xsurface,
struct wlr_xwayland_surface *xsurface, xcb_atom_t property,
xcb_get_property_reply_t *reply) {
if (reply->type != XCB_ATOM_STRING && reply->type != xwm->atoms[UTF8_STRING] &&
reply->type != XCB_ATOM_NONE) {
@ -747,21 +748,34 @@ static void read_surface_title(struct wlr_xwm *xwm,
return;
}
bool is_utf8 = reply->type == xwm->atoms[UTF8_STRING];
if (!is_utf8 && xsurface->has_utf8_title && reply->type != XCB_ATOM_NONE) {
return;
size_t len = xcb_get_property_value_length(reply);
const char *title_buffer = xcb_get_property_value(reply);
char *title = NULL;
if (len > 0) {
title = strndup(title_buffer, len);
}
size_t len = xcb_get_property_value_length(reply);
char *title = xcb_get_property_value(reply);
if (property == XCB_ATOM_WM_NAME) {
free(xsurface->wm_name);
xsurface->wm_name = title;
} else if (property == xwm->atoms[NET_WM_NAME]) {
free(xsurface->net_wm_name);
xsurface->net_wm_name = title;
} else {
abort(); // unreachable
}
free(xsurface->title);
if (len > 0) {
xsurface->title = strndup(title, len);
// Prefer _NET_WM_NAME over WM_NAME if available
if (xsurface->net_wm_name != NULL) {
xsurface->title = xsurface->net_wm_name;
} else if (xsurface->wm_name != NULL) {
xsurface->title = xsurface->wm_name;
} else {
xsurface->title = NULL;
}
xsurface->has_utf8_title = is_utf8;
// TODO: drop this field
xsurface->has_utf8_title = reply->type == xwm->atoms[UTF8_STRING];
wl_signal_emit_mutable(&xsurface->events.set_title, NULL);
}
@ -1061,7 +1075,7 @@ static void read_surface_property(struct wlr_xwm *xwm,
read_surface_class(xwm, xsurface, reply);
} else if (property == XCB_ATOM_WM_NAME ||
property == xwm->atoms[NET_WM_NAME]) {
read_surface_title(xwm, xsurface, reply);
read_surface_title(xwm, xsurface, property, reply);
} else if (property == XCB_ATOM_WM_TRANSIENT_FOR) {
read_surface_parent(xwm, xsurface, reply);
} else if (property == xwm->atoms[NET_WM_PID]) {