Removed dashed lines surrounding tooltips on some gtk themes

src/tooltips.cpp

@@ -214,6 +214,7 @@ void Tooltip::show(bool disregard_drawn, const std::function<void()> &on_motion)
     size.second += 8; // 2xpadding + 2
 
     scrolled_window = Gtk::manage(new Gtk::ScrolledWindow());
+    scrolled_window->get_style_context()->add_class("juci_tooltip_scrolledwindow");
     scrolled_window->property_hscrollbar_policy() = Gtk::PolicyType::POLICY_NEVER;
     scrolled_window->property_vscrollbar_policy() = Gtk::PolicyType::POLICY_NEVER;
     scrolled_window->add(*tooltip_text_view);

src/window.cpp

@@ -50,6 +50,7 @@ Window::Window() {
     .juci_tooltip_window {background-color: transparent;}
     .juci_tooltip_box {)" + border_radius_style +
                            R"(padding: 3px;}
+    .juci_tooltip_scrolledwindow undershoot.top, undershoot.right, undershoot.bottom, undershoot.left {background-image: initial;}
     .juci_message_window {background-color: transparent;}
     .juci_message_box {)" +
                            border_radius_style +