Backport #30175 by @jmlt2002
- Inline math blocks couldn't be preceeded or succeeded by
alphanumerical characters due to changes introduced in PR #21171.
Removed the condition that caused this (precedingCharacter condition)
and added a new exit condition of the for-loop that checks if a specific
'$' was escaped using '\' so that the math expression can be rendered as
intended.
- Additionally this PR fixes another bug where math blocks of the type
'$xyz$abc$' where the dollar sign was not escaped by the user, generated
an error (shown in the screenshots below)
- Altered the tests to accomodate for the changes
Former behaviour (from try.gitea.io):
Fixed behaviour (from my local build):
(Edit) Source code for the README.md file:
```
$x$ -$x$ $x$-
a$xa$ $xa$a 1$xb$ $xb$1
$a a$b b$
a$b $a a$b b$
$a a\$b b$
```
Signed-off-by: João Tiago <joao.leal.tintas@tecnico.ulisboa.pt>
Co-authored-by: João Tiago <114936010+jmlt2002@users.noreply.github.com>
(cherry picked from commit 5123ed31914f704348c0660468a3707011f5a160)
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