Tables: extracted some code into TableBeginContextMenuPopup() for easier reuse for appending into context menu.

imgui_internal.h

@@ -2753,6 +2753,7 @@ namespace ImGui
     IMGUI_API void          TableUpdateColumnsWeightFromWidth(ImGuiTable* table);
     IMGUI_API void          TableDrawBorders(ImGuiTable* table);
     IMGUI_API void          TableDrawContextMenu(ImGuiTable* table);
+    IMGUI_API bool          TableBeginContextMenuPopup(ImGuiTable* table);
     IMGUI_API void          TableMergeDrawChannels(ImGuiTable* table);
     inline ImGuiTableInstanceData*   TableGetInstanceData(ImGuiTable* table, int instance_no) { if (instance_no == 0) return &table->InstanceDataFirst; return &table->InstanceDataExtra[instance_no - 1]; }
     IMGUI_API void          TableSortSpecsSanitize(ImGuiTable* table);

imgui_tables.cpp

@@ -1105,19 +1105,11 @@ void ImGui::TableUpdateLayout(ImGuiTable* table)
     table->IsUsingHeaders = false;
 
     // [Part 11] Context menu
-    if (table->IsContextPopupOpen && table->InstanceCurrent == table->InstanceInteracted)
+    if (TableBeginContextMenuPopup(table))
-    {
-        const ImGuiID context_menu_id = ImHashStr("##ContextMenu", 0, table->ID);
-        if (BeginPopupEx(context_menu_id, ImGuiWindowFlags_AlwaysAutoResize | ImGuiWindowFlags_NoTitleBar | ImGuiWindowFlags_NoSavedSettings))
     {
         TableDrawContextMenu(table);
         EndPopup();
     }
-        else
-        {
-            table->IsContextPopupOpen = false;
-        }
-    }
 
     // [Part 13] Sanitize and build sort specs before we have a change to use them for display.
     // This path will only be exercised when sort specs are modified before header rows (e.g. init or visibility change)
@@ -3035,6 +3027,17 @@ void ImGui::TableOpenContextMenu(int column_n)
     }
 }
 
+bool ImGui::TableBeginContextMenuPopup(ImGuiTable* table)
+{
+    if (!table->IsContextPopupOpen || table->InstanceCurrent != table->InstanceInteracted)
+        return false;
+    const ImGuiID context_menu_id = ImHashStr("##ContextMenu", 0, table->ID);
+    if (BeginPopupEx(context_menu_id, ImGuiWindowFlags_AlwaysAutoResize | ImGuiWindowFlags_NoTitleBar | ImGuiWindowFlags_NoSavedSettings))
+        return true;
+    table->IsContextPopupOpen = false;
+    return false;
+}
+
 // Output context menu into current window (generally a popup)
 // FIXME-TABLE: Ideally this should be writable by the user. Full programmatic access to that data?
 void ImGui::TableDrawContextMenu(ImGuiTable* table)