Fixed context popup windows from not having the NoDocking flag. (#2763)

imgui.cpp

@@ -8276,7 +8276,7 @@ void ImGui::CloseCurrentPopup()
         window->DC.NavHideHighlightOneFrame = true;
 }
 
-bool ImGui::BeginPopupEx(ImGuiID id, ImGuiWindowFlags extra_flags)
+bool ImGui::BeginPopupEx(ImGuiID id, ImGuiWindowFlags flags)
 {
     ImGuiContext& g = *GImGui;
     if (!IsPopupOpen(id))
@@ -8286,12 +8286,13 @@ bool ImGui::BeginPopupEx(ImGuiID id, ImGuiWindowFlags extra_flags)
     }
 
     char name[20];
-    if (extra_flags & ImGuiWindowFlags_ChildMenu)
+    if (flags & ImGuiWindowFlags_ChildMenu)
         ImFormatString(name, IM_ARRAYSIZE(name), "##Menu_%02d", g.BeginPopupStack.Size); // Recycle windows based on depth
     else
         ImFormatString(name, IM_ARRAYSIZE(name), "##Popup_%08x", id); // Not recycling, so we can close/open during the same frame
 
-    bool is_open = Begin(name, NULL, extra_flags | ImGuiWindowFlags_Popup);
+    flags |= ImGuiWindowFlags_Popup | ImGuiWindowFlags_NoDocking;
+    bool is_open = Begin(name, NULL, flags);
     if (!is_open) // NB: Begin can return false when the popup is completely clipped (e.g. zero size display)
         EndPopup();
 
@@ -8306,7 +8307,7 @@ bool ImGui::BeginPopup(const char* str_id, ImGuiWindowFlags flags)
         g.NextWindowData.ClearFlags(); // We behave like Begin() and need to consume those values
         return false;
     }
-    flags |= ImGuiWindowFlags_AlwaysAutoResize | ImGuiWindowFlags_NoTitleBar | ImGuiWindowFlags_NoSavedSettings | ImGuiWindowFlags_NoDocking;
+    flags |= ImGuiWindowFlags_AlwaysAutoResize | ImGuiWindowFlags_NoTitleBar | ImGuiWindowFlags_NoSavedSettings;
     return BeginPopupEx(g.CurrentWindow->GetID(str_id), flags);
 }