fix(highlight): #747 Add line offset to highlight line

PrismJS sort of broken backward compatibility, while trying to improve
highlight resilience[^1]. Since then it is required to add
`data-line-offset` for any code, which doesn't start counting from 1,
which is pretty each time, we deal with stack frames.

This commits add silently required data attribute in HTML, bringing back
highlight feature and recovering from some fall through errors, raised
by `TypeError` in JS execution flow (i.e. switching application and full
frames tabs).

[^1]: https://github.com/PrismJS/prism/commit/9a4e725b76d22759fec58e1929450bbfe1bb6661

Signed-off-by: Bart Jaskulski <bjaskulski@protonmail.com>

CHANGELOG.md

@@ -1,5 +1,9 @@
 # CHANGELOG
 
+## Unreleased
+
+* Fixed missing code highlight, which additionally led to issue with switching tabs, between application and all frames ([#747](https://github.com/filp/whoops/issues/747)).
+
 ## v2.15.1
 
 * Fixed bug with PrettyPageHandler "*Calling `getFrameFilters` method on null*" ([#751](https://github.com/filp/whoops/pull/751)).

src/Whoops/Resources/views/frame_code.html.php

@@ -31,6 +31,7 @@
         ?>
             <pre class="code-block line-numbers"
               data-line="<?php echo $line ?>"
+              data-line-offset="<?php echo $start ?>"
               data-start="<?php echo $start ?>"
             ><code class="language-php"><?php echo $tpl->escape($code) ?></code></pre>