Auto merge of #45711 - tirr-c:unicode-span, r=estebank
Display spans correctly when there are zero-width or wide characters
Hopefully...
* fixes #45211
* fixes #8706
---
Before:
```
error: invalid width `7` for integer literal
--> unicode_2.rs:12:25
|
12 | let _ = ("a̐éö̲", 0u7);
| ^^^
|
= help: valid widths are 8, 16, 32, 64 and 128
error: invalid width `42` for integer literal
--> unicode_2.rs:13:20
|
13 | let _ = ("아あ", 1i42);
| ^^^^
|
= help: valid widths are 8, 16, 32, 64 and 128
error: aborting due to 2 previous errors
```
After:
```
error: invalid width `7` for integer literal
--> unicode_2.rs:12:25
|
12 | let _ = ("a̐éö̲", 0u7);
| ^^^
|
= help: valid widths are 8, 16, 32, 64 and 128
error: invalid width `42` for integer literal
--> unicode_2.rs:13:20
|
13 | let _ = ("아あ", 1i42);
| ^^^^
|
= help: valid widths are 8, 16, 32, 64 and 128
error: aborting due to 2 previous errors
```
Spans might display incorrectly on the browser.
r? @estebank
12e6b53744