Tables: Fixed support for cross-cell SameLine() by preserving Line Y1 position. Amend 8f5ce73.

imgui_tables.cpp

@@ -2017,7 +2017,7 @@ void ImGui::TableBeginCell(ImGuiTable* table, int column_n)
     window->DC.CursorPos.y = table->RowPosY1 + table->CellPaddingY;
     window->DC.CursorMaxPos.x = window->DC.CursorPos.x;
     window->DC.ColumnsOffset.x = start_x - window->Pos.x - window->DC.Indent.x; // FIXME-WORKRECT
-    window->DC.CursorPosPrevLine = window->DC.CursorPos; // This allows users to call SameLine() to share LineSize between columns.
+    window->DC.CursorPosPrevLine.x = window->DC.CursorPos.x; // PrevLine.y is preserved. This allows users to call SameLine() to share LineSize between columns.
     window->DC.CurrLineTextBaseOffset = table->RowTextBaseline;
     window->DC.NavLayerCurrent = (ImGuiNavLayer)column->NavLayerCurrent;