Only enable viewports on multimodal apps (like the editors)

* Dragging out windows on games and stuff is pointless and just adds complexity

engine/core/include/app.hpp

@@ -30,6 +30,7 @@ namespace prism {
         virtual void render([[maybe_unused]] GFXCommandBuffer* command_buffer) {}
 
         virtual bool wants_no_scene_rendering() { return false; }
+        virtual bool is_multimodal() { return false; }
     };
 }
 

engine/core/src/engine.cpp

@@ -58,6 +58,10 @@ void engine::set_app(prism::app* p_app) {
     Expects(p_app != nullptr);
 
     this->current_app = p_app;
+
+    if(platform::supports_feature(PlatformFeature::Windowing) && ::engine->get_app()->is_multimodal()) {
+        ImGui::GetIO().ConfigFlags |= ImGuiConfigFlags_ViewportsEnable;
+    }
 }
 
 prism::app* engine::get_app() const {

engine/core/src/imgui_backend.cpp

@@ -7,6 +7,7 @@
 #include "platform.hpp"
 #include "assertions.hpp"
 #include "input.hpp"
+#include "app.hpp"
 
 using prism::imgui_backend;
 
@@ -44,9 +45,6 @@ imgui_backend::imgui_backend() {
     io.BackendFlags |= ImGuiBackendFlags_PlatformHasViewports;
     io.BackendPlatformName = "Prism";
 
-    if(platform::supports_feature(PlatformFeature::Windowing))
-        io.ConfigFlags |= ImGuiConfigFlags_ViewportsEnable;
-    
     for (auto& [im, pl] : imToPl)
         io.KeyMap[im] = platform::get_keycode(pl);
         

tools/common/include/commoneditor.hpp

@@ -133,6 +133,7 @@ public:
     virtual void asset_selected([[maybe_unused]] std::filesystem::path path, [[maybe_unused]] AssetType type) {}
 
     bool wants_no_scene_rendering() override { return true; }
+    bool is_multimodal() override { return true; }
 
     void createDockArea();
     void drawViewport(Scene* scene);

tools/common/src/commoneditor.cpp

@@ -387,8 +387,9 @@ Transform stored_transform;
 
 bool IsItemActiveLastFrame() {
     ImGuiContext& g = *GImGui;
-    if (g.ActiveIdPreviousFrame)
+    // TODO: uh oh this is broken now :-(
-        return g.ActiveIdPreviousFrame == g.CurrentWindow->DC.LastItemId;
+    //if (g.ActiveIdPreviousFrame)
+    //    return g.ActiveIdPreviousFrame == g.CurrentWindow->DC.LastItemId;
     
     return false;
 }