Steps to reproduce

• vim --clean -c ':set mouse=a ruler termwinscroll=100000' -c ':term'
• in the top terminal run seq 99900
• <c-w>N to goto terminal normal mode (ensure line number displayed in the ruler is >99900), then i
• sleep 3;seq 800, then click to the other window (blank buffer) before the sleep is done
• ZZ to quit that buffer. This will trigger resizing the terminal and E315.

Expected behaviour

no error happened

Version of Vim

9.1.1071

Side note: the previous issue #16024 was fixed in 9.1.1062. Indeed the instruction in that issue does not reproduce this issue.

Another variant that reproduces the issue is the following:

• vim --clean -c ':set mouse=a ruler termwinscroll=100000' -c ':new' -c ':term'
• in the top terminal run seq 99900
• <c-w>N to goto terminal normal mode (ensure line number displayed in the ruler is >99900), then i
• sleep 3;seq 800, then click to the bottommost window (blank buffer) before the sleep is done
• use the mouse to drag the horizontal splitter between the center window and the bottommost window upward in such a way that it pushes the other horizontal splitter upward, causing the terminal to be resized.

Environment

Linux, xterm