remember channels you were in last

webpage/channel.ts

@@ -686,6 +686,8 @@ class Channel extends SnowFlake{
 			this.myhtml.classList.add("viewChannel");
 		}
 		this.guild.prevchannel=this;
+		this.guild.perminfo.prevchannel=this.id;
+		this.localuser.userinfo.updateLocal();
 		this.localuser.channelfocus=this;
 		const prom=this.infinite.delete();
 		history.pushState(null, "","/channels/"+this.guild_id+"/"+this.id);