Rewrite "pending input" popup to be clearer

[mr-aryanwasule]

run code problem the cell not executed due to pending input _ **the cell has not been executed to avoid kernal deadlock as there is another pending input! Submit your pending input and try again**
#this problem faced...

[welcome]

Thank you for opening your first issue in this project! Engagement like this is essential for open source projects! 🤗

If you haven't done so already, check out Jupyter's Code of Conduct. Also, please try to follow the issue template as it helps other other community members to contribute more effectively.

You can meet the other Jovyans by joining our Discourse forum. There is also an intro thread there where you can stop by and say Hi! 👋

Welcome to the Jupyter community! 🎉

[krassowski]

This means that one of your cells has an input box which you need to submit before you can continue. For example in Python the input boxes come from executing input() or getpass() functions (but specific kernels can sent these boxes any time when user input is required):

[JasonWeill]

@mr-aryanwasule Can you please provide information about the OS name and version and the JupyterLab version you're running? Also, if possible, attaching a notebook or a screen shot of the problem would help us to diagnose this issue further.

[krassowski]

(To clarify, further details are not needed here - the dialog just needs to make the instructions easier to understand; currently this guards against kernel deadlock but users have no idea what a kernel deadlock is because, well the guard works well against it; the instructions need to specify how to recover, i.e. type something in the input box and press Enter)

[krassowski]

Flagging this as higher priority because it was reported a few more times, see:

• https://discourse.jupyter.org/t/input-function-not-working/2290/14
• https://discourse.jupyter.org/t/cell-not-executed-due-to-pending-input/24036