fix multi-dpi scaling

README.md

@@ -77,17 +77,13 @@ user-level service manager like s6 or `systemd --user`.
 dwl is a work in progress, and it has not yet reached its feature goals in a
 number of ways:
 
-- Features not yet implemented:
-    - xdg-shell popups
-    - Urgent/attention/focus-request
-    - Normal/selected/urgent border colors
-    - layer-shell
-    - Statusbar support (built-in or external)
-    - Damage tracking
-    - Fullscreen/fixed windows (or whatever the Wayland analogues are)
-    - XWayland
-- HiDPI works, but multi-DPI is not as nice as sway, depending on the scale
-  factors involved.  Perhaps scaling filters are needed?
+- Urgent/attention/focus-request
+- Normal/selected/urgent border colors
+- layer-shell
+- Statusbar support (built-in or external)
+- Damage tracking
+- Fullscreen/fixed windows (or whatever the Wayland analogues are)
+- XWayland
 
 
 ## Acknowledgements

dwl.c

@@ -633,6 +633,8 @@ maprequest(struct wl_listener *listener, void *data)
 	wl_list_insert(&clients, &c->link);
 	wl_list_insert(&fstack, &c->flink);
 	wl_list_insert(&stack, &c->slink);
+	/* XXX should check all outputs, also needs a send_leave counterpart */
+	wlr_surface_send_enter(c->xdg_surface->surface, c->mon->wlr_output);
 	keyboardfocus(c, NULL);
 }
 
@@ -1033,6 +1035,8 @@ sendmon(Client *c, Monitor *m)
 	if (c->mon == m)
 		return;
 	c->mon = m;
+	/* XXX should check all outputs, also needs a send_leave counterpart */
+	wlr_surface_send_enter(c->xdg_surface->surface, c->mon->wlr_output);
 	c->tags = m->tagset[m->seltags]; /* assign tags of target monitor */
 
 	if (c == selclient())