[Github-comments] [geany/geany] Ruby wrong syntax highlighting (#2038)

[Niboucha Redouane]

Geany wrongly colors sequences starting with a percentage sign (%).
Program that illustrates some issues:
```
n = 1337;
w = r = 5
x = n%w + 1; # "%w " is recognised as the beginning of an array of words, like %w[ ... ]
y = n%r ;   # "%r " is recognised as the beginning of a regular expression
string = %= this is a string = ;  # this one is correctly colored
n %= w;  # this is the most important issue, the expression is equivalent to n = n % w; but it's recognised like the previous line
print x%r  # %r is also recognised like a beginning of regex, but in this case, the %= of the previous line is still not terminated (no equal sign encoutered).
```

Tested on Geany 1.33 on Linux (Debian).

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https://github.com/geany/geany/issues/2038
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