Fixed clipped ImGui::Combo not registering its size properly (was flickering when scrolling with combo on the edge of clipping region)

imgui.cpp

@@ -4935,17 +4935,17 @@ bool ImGui::Combo(const char* label, int* current_item, bool (*items_getter)(voi
     const ImGuiID id = window->GetID(label);
 
     const ImVec2 text_size = CalcTextSize(label);
-    const float arrow_size = (window->FontSize() + style.FramePadding.x * 2.0f);
     const ImGuiAabb frame_bb(window->DC.CursorPos, window->DC.CursorPos + ImVec2(window->DC.ItemWidth.back(), text_size.y) + style.FramePadding*2.0f);
-    const ImGuiAabb bb(frame_bb.Min, frame_bb.Max + ImVec2(style.ItemInnerSpacing.x + text_size.x,0));
 
+    ItemSize(frame_bb);
     if (ClipAdvance(frame_bb))
         return false;
 
+    const ImGuiAabb bb(frame_bb.Min, frame_bb.Max + ImVec2(style.ItemInnerSpacing.x + text_size.x,0));
+	const float arrow_size = (window->FontSize() + style.FramePadding.x * 2.0f);
     const bool hovered = (g.HoveredWindow == window) && (g.HoveredId == 0) && IsMouseHoveringBox(bb);
 
     bool value_changed = false;
-    ItemSize(frame_bb);
     RenderFrame(frame_bb.Min, frame_bb.Max, window->Color(ImGuiCol_FrameBg));
     RenderFrame(ImVec2(frame_bb.Max.x-arrow_size, frame_bb.Min.y), frame_bb.Max, window->Color(hovered ? ImGuiCol_ButtonHovered : ImGuiCol_Button));
     RenderCollapseTriangle(ImVec2(frame_bb.Max.x-arrow_size, frame_bb.Min.y) + style.FramePadding, true);