xrUICore/Windows/UIWindow.cpp: better windows colouring for UI Debugger

Currently focused will now be coloured in gold.
Other elements registered in the focus system will be green.
Also, depending on whether the cursor is over the window, the alpha
color will be weaker or stronger.

src/xrUICore/Windows/UIWindow.cpp

@@ -535,34 +535,34 @@ bool CUIWindow::FillDebugTree(const CUIDebugState& debugState)
     const bool hovered = ImGui::IsItemHovered(ImGuiHoveredFlags_AllowWhenDisabled);
     if (debugState.drawWndRects && (IsShown() || hovered))
     {
+        const auto& focus = UI().Focus();
+
         Frect rect;
         GetAbsoluteRect(rect);
         UI().ClientToScreenScaled(rect.lt, rect.lt.x, rect.lt.y);
         UI().ClientToScreenScaled(rect.rb, rect.rb.x, rect.rb.y);
 
         // XXX: make colours user configurable
-        u32 color = color_rgba(255, 0, 0, 255);
+        const u32 alpha = CursorOverWindow() ? 255 : 200;
+        Fcolor color = color_rgba(0, 0, 255, alpha);
         if (hovered)
-            color = color_rgba(255, 255, 0, 255);
+            color = color_rgba(0, 255, 255, 255);
+        else if (focus.GetFocused() == this)
+            color = color_rgba(255, 215, 0, 255);
         else if (debugState.coloredRects)
         {
             // This is pseudo RNG, so when we are seeding it with 'this' pointer
             // we can expect predictable and stable values (no *blinking* at all)
             CRandom rnd;
             rnd.seed((s32)(intptr_t)this);
-            color = color_rgba(rnd.randI(255), rnd.randI(255), rnd.randI(255), 255);
-        }
-        else if (IsFocusValuable(nullptr))
-        {
-            if (CursorOverWindow())
-                color = color_rgba(200, 150, 200, 255);
-            else
-                color = color_rgba(255, 0, 255, 255);
+            color = color_rgba(rnd.randI(255), rnd.randI(255), rnd.randI(255), alpha);
         }
+        else if (focus.IsRegistered(this))
+            color = color_rgba(0, 255, 0, alpha);
 
         const auto mainVP = ImGui::GetMainViewport();
         const auto draw_list = hovered ? ImGui::GetForegroundDrawList(mainVP) : ImGui::GetBackgroundDrawList(mainVP);
-        draw_list->AddRect((const ImVec2&)rect.lt, (const ImVec2&)rect.rb, color);
+        draw_list->AddRect((const ImVec2&)rect.lt, (const ImVec2&)rect.rb, color.get_windows());
     }
 
     if (open)