[Noticed in 4.9.0, but that version is not yet available in the bug report form's "Release" pull down menu, so I've chosen 4.8.0, which probably has that issue as well, but I haven't tested it with 4.8.0 yet.]

How to reproduce:

Open an xterm with a width of 80 columns, e.g. an 80x25 xterm.

In the xterm start a screen session by calling "screen".

Then press Ctrl-A : to get a screen commandline prompt.

Try to enter "screen echo 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27" at this prompt.

You won't be able to enter "26 27" at end. Input just stops. If you press Enter afterwards, only "screen echo 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 " will be in the prompt's commandline history.

Now resize the xterm to at least 160 columns width. (I use "while :; do echo $LINES x $COLUMNS; sleep 0.1; done" to monitor the window's size.)

Press Ctrl-A : to get a screen commandline prompt.

Use cursor up to get the previous command and try to extend it with "26 27 28 29 30" or try to enter "screen echo 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30" at this prompt.

It works this time.

This issue was found when analysing https://savannah.gnu.org/bugs/?61504 and is potentially related to it or at least a similar type of issue.

Because if you try to enter "Ctrl-A :screen echo 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62" in an 200 columns wide screen session, you'll get the message

: too many tokens.

since MAXARGS is reached. (https://savannah.gnu.org/bugs/?61504 is about NOT getting this message of these parameters are given on the commandline. Instead only the first 62 parameters are passed to the command and the remaining ones are silently dropped and hence lost.)

Please also note that the "%s" format string in "%s: too many tokens" seems to be passed the empty string in this case, which seems a (minor) bug in itself.