[10.x] Show source content on last line when CLI dump output is greater than display height

[calebdw]

Hello!

This PR builds upon #44211 and also displays the source content at the end of the dd output when the output is larger than the display height.

I've had several instance in CLI mode where a dd outputs miles of text, and I have to scroll for a long time to to try and find the source. Also having the source at the bottom is super convenient:

[calebdw]

@nunomaduro, is there anything holding up this PR?

[morloderex]

@calebdw draft pr's are not reviewed, as far as i know.

[nunomaduro]

What happens if the user dds multiple values. Something like dd(range(1, 50), range(1, 50));? It does reads weird for me:

Feel free to re-open this pull request - if you offer a solution for this situation.

[calebdw]

@nunomaduro, that's because the source content is printed at both the beginning and end in this case...

I suppose we could do one of two things:

1. Always print the source content on the last line
2. Switch from printing on the first line to the last line if the output is larger than the display height

(1) would be the easiest / most consistent solution as there would be no need to check the display height and functionally it would work for all situations no matter how large the output is.

[nunomaduro]

@nunomaduro, that's because the source content is printed at both the beginning and end in this case...

I am aware.

Always print the source content on the last line

Feel that I kind of prefer to see the source on the first line by default.

Switch from printing on the first line to the last line if the output is larger than the display height

This will cause an issue when dumping two values, and the second is a one-liner:

[calebdw]

@nunomaduro, I don't see an issue with that...you'll get the exact same thing if you try to dd two ints:

How do you propose to find the source of a dd when it's dumping 5,000+ lines (this has happened)? I believe the best solution would be to simply move the source to the last line for all cases

[nunomaduro]

Can you make a new pull request where you propose that change? With clear screenshots of the before vs after? Thanks!