impr: Add close button to toolbar

main/gui/source/window/window.cpp

@@ -569,6 +569,12 @@ namespace hex {
                     ImGui::SameLine();
                 }
 
+                if (auto provider = ImHexApi::Provider::get(); provider != nullptr) {
+                    if (ImGui::CloseButton(ImGui::GetID("ProviderCloseButton"), ImGui::GetCursorScreenPos() + ImVec2(ImGui::GetContentRegionAvail().x - 17_scaled, 3_scaled))) {
+                        ImHexApi::Provider::remove(provider);
+                    }
+                }
+
                 ImGui::EndMenuBar();
             }
 

plugins/builtin/include/content/providers/null_provider.hpp

@@ -11,7 +11,7 @@ namespace hex::plugin::builtin {
             EventManager::subscribe<EventProviderOpened>([this](auto *newProvider) {
                 if (newProvider == this)
                     return;
-                
+
                 ImHexApi::Provider::remove(this, true);
             });
         }