Replace alert box with modal ui

[jidanni]

Allow copying the example (switch...) in

in fact allow copying the whole thing.
As it is currently, the user can't even do Inspect Element on it.

[bhousel]

All the normal window stuff like select/copy/paste works fine here for me (in chrome 64)... What else have you tried? Are you sure this is a real issue?

[jidanni]

I can do like you in Firefox.
I can copy the text mentioned in
https://bugs.chromium.org/p/chromium/issues/detail?id=5879

But, with

Package: chromium
Version: 64.0.3282.119-2
Kernel: Linux 4.14.0-3-amd64 (SMP w/2 CPU cores)

the pointer remains an arrow over the entire box.
There is no right context menu.

[bhousel]

It sounds like a browser bug outside of our control.

If we swap out the window.prompt for a custom modal, as described here, #4802 (comment) then we wouldn't be relying on the browser behavior and this issue would go away.

[jidanni]

OK submitted https://bugs.chromium.org/p/chromium/issues/detail?id=812644

[jidanni]

In https://bugs.chromium.org/p/chromium/issues/detail?id=812644#c6
they say

Could you provide HTML+CSS for alter box?
It seems user-select CSS property prevents to select contents in alter box
except for text box.

[bhousel]

In https://bugs.chromium.org/p/chromium/issues/detail?id=812644#c6
they say

You can point them at http://preview.ideditor.com/master as an example..

user-select should not affect the selectability of text in a window.prompt, and I'm using Chrome and I don't see this issue, so it might just be Chrome on Linux that has the issue.

[bhousel]

Assigned to @vershwal

[bhousel]

This was done in #5207