RFR: 4850101: Setting mnemonic to VK_F4 underlines the letter S in a button.

Tue Aug 2 11:56:06 UTC 2022

On Tue, 2 Aug 2022 10:22:48 GMT, Prasanta Sadhukhan <psadhukhan at openjdk.org> wrote:

> It is seen that using VK_F4 in JButton's setMnemonic(int i), causes the letter 'S' in the JButton to be underlined if JButton's text has 'S' in its string.
> This is because [**VK_F4**](https://github.com/openjdk/jdk/blob/master/src/java.desktop/share/classes/java/awt/event/KeyEvent.java#L506) keycode is 0x73 (115 in decimal) which happens to be value of lowercase [**'s'** ](https://www.cs.cmu.edu/~pattis/15-1XX/common/handouts/ascii.html) so as per the logic implemented in SwingUtilities.findDisplayedMnemonicIndex(), the first index of the character (either lowecasr or uppercase) is returned as a mnemonic, which gets underlined.
> 
> Fix is made to ignore Action Keys from VK_F1->VK_F11 as displayed mnemonic which corresponds to lowercase p->z

Marked as reviewed by AJ1032480 at github.com (no known OpenJDK username).

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PR: https://git.openjdk.org/jdk/pull/9712