feat: css query for last workspace

Author: ThatOneCalculator

src/modules/niri/workspaces.cpp

@@ -67,6 +67,20 @@ void Workspaces::doUpdate() {
     else
       style_context->remove_class("active");
 
+    if (ws["idx"].asUInt() == workspaces.size() && workspaces.size() > 1) { 
+      style_context->add_class("last");
+      style_context->remove_class("solo");
+    }
+    else {
+      if (ws["idx"].asUInt() == workspaces.size() && workspaces.size() == 1) {
+        style_context->remove_class("last");
+        style_context->add_class("solo");
+      }
+      else {
+        style_context->remove_class("last");
+        style_context->remove_class("solo");
+      }
+    }
     if (ws["output"]) {
       if (ws["output"].asString() == bar_.output->name)
         style_context->add_class("current_output");