styles mis-matches closing symbols present inside a nested codeblock

[joseluis]

For example, having something* in a codeblock that's inside an opened italic group with * closes that italic group beore the codeblock closes. The same for any other style groups.

In general, the style symbol should not be matched when it's inside a codeblock.

  -  *ABC*     OK italic style
  -  `ABC`     OK colored code
  - *`ABC`*    ±OK italic style but uncolored code
  - *`ABC*`*   ERR` italic group matches the next * and the code block bleeds over next `
  - *`ABC*D`*  ±OK thanks to the alphanumeric ASCII character. But normal style colored code.
  - *`ABC*á`*  ERR` non-ASCII-alphanumeric characters aren't considered
  - _`ABC_€`_  ERR` same with underscores
  - _`ABC*`_   ±OK the only workaround is to use _ or * depending on what's inside
  - *`ABC_`*   ±OK and vicersa
  - **`ABC**`**   ERR` the same happens with bold
  - ~~`ABC~~`~~   ERR` the same happens with strike

Ideally it would be nice to also have colored code blocks regardless of other styles but that's unrelated.