LyX 2.3.x: how to insert externally generated code for table?

[Daniel]

On 2020-03-05 05:19, Andrew Parsloe wrote:
> One way is to put an ert inset inside a preview inset inside a table 
> float and paste the table code into the ert inset. Move the cursor 
> outside the float and wait while preview does its thing. I did just that 
> and attach the result.
> 
> Andrew

I guess that's is the only way to get the original output in this case 
because LyX does not support double lines at the outer edges of tables 
(only at the inner ones).

LyX uses single left/right/top/bottom lines to create double lines 
(rather than setting single/double lines directly) which makes outer 
double lines impossible.

Daniel