Typing polish letters in game chat is broken. Left/right alt recognization broken?

I can confirm this problem. It's very annoying and made chatting in the game much harder for Polish players.

Do you really get that issue in 1.8.1 ?

Yes, I just checked it in 1.8.1:

1. I started the game (version 1.8.1)
2. I typed "Testing", then right alt+a (should make Polish letter "ą", instead it selected the entire word), and then right alt+c (should make Polish letter "ć", instead it copied the text to the clipboard).
3. I started Notepad++ to check if I could paste the text. It worked as I suspected (after using Ctrl+v, I got "Testing").

I have no way to replicate this 😞

How about this method of replicating the bug:
1. Switch the language for the keyboard to English (using the Windows widget for that) when the game is started.
2. After you entered the world, start the chat, and type right alt+c. When the language setting is set to English in Windows (when the window of the game is in focus), it should give "©" sign. (In the version 1.7.10 of the game, it works as it should.)
3. In 1.8.1 and in 1.8.2-pre6, instead it copies the marked text to the clipboard.

I have also checked how right alt+c works in another program when the language is set to English: in Notepad++, it also gives "©" sign.

This is how it can be replicated in most of computers using Windows (at least in Windows 7, which I use most of the time), as very often you can switch the input between English and native language.

This is MC-68642

This is already from the 1.8, newer versions are just still infected with this bug. (też jestem z Polski)

I checked my method with English language, and it works with American-international input method, so it requires to have US English language pack installed (for Windows). So the method is not as good as I thought at first.

The problem exists also in Windows 8.1 and Java 8, so it's not related just to Java 7 or Windows 7.

It's still present on 1.8.3. It's very annoying to not be able to input "ą" and "ć".