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I've found the cause.

The shortcut is defined as this in the plugin bindings extension :

Esc ]

The problem is that on a QWERTY keyboard the bracket ']' has its own key whereas on an AZERTY keyboard, we need to hit the <CTRL + ALT + )> keystroke to write a bracket ']'.

According to the locale, some key bindings are likely to malfunction if a character correspond to a key sequence.

The problem can be fixed by precising the locale "en" for the "goto matching bracket" key binding and adding another key binding with a "fr" locale and "Esc )" sequence for example.

The problem now is that with a spanish locale/keyboard, the ")" character is the <SHIFT + 9> sequence...

How make sure that the key binding will function in all the countries ?
There may be other shortcuts that malfunction on several keyboards...