Dead keys followed by space

[Kevin Rushforth]

I would not recommend internal APIs, unless someone wants to build 
JavaFX to help diagnose it.

In any case it sounds like Johan has discovered a bug -- at least on 
Windows -- in the key handler for dead keys. We should test this on 
macOS and Linux as well.

  -- Kevin

On 9/25/2024 8:14 AM, Thiago Milczarek Sayão wrote:
> Johan,
>
> It's an internal API, but we can use it for testing purposes (I'm not 
> sure if there's a public API for that).
> SceneHelper.enableInputMethodEvents(scene, false);
> IME is used for entering complex characters in some languages such as 
> Chinese, Korean, Japanese, etc.
>
> On Linux, setting the keyboard to en_US will also add the extra space, 
> except if I choose the en_US with dead keys variation.
>
> If you try it on notepad, is it the same behaviour? If not, I think it 
> might be a bug.
>
> -- Thiago.
>
>
> Em qua., 25 de set. de 2024 às 11:12, Johan Corveleyn 
> <jcorvel at gmail.com> escreveu:
>
>     Hi Thiago,
>
>     Thank you for your answer. I am experiencing this issue on Windows
>     (Windows 10 and 11).
>
>     Now, it dawns on me that:
>     - I have a QWERTY keyboard (standard US layout).
>     - I have my keyboard layout setting in Windows configured to "US
>     International". That way the keys for ~, ^, ', " become "dead keys"
>     (waiting for next keystroke).
>     - If I change my keyboard layout setting to "US" then I can't
>     reproduce anymore because those keystrokes no longer act like dead
>     keys (~, ^, ... immediately give that character).
>
>     I don't know how this is handled on Linux or Mac. Do they also have
>     something like a "US International" keyboard layout setting so ^
>     becomes a dead key? Or does it work differently if I want to type â or
>     ë, or a standalone ^?
>
>     I'm not sure what you mean by disabling IME or how to know that it's
>     enabled. Can I enable/disable this programmatically in JavaFX? Or is
>     this an OS keyboard layout setting (anyway: just having a standard "US
>     input" makes this non reproducible because I can no longer type dead
>     keys)?
>
>     If you have a keyboard input with dead keys it's super easy to test
>     this with a simple program like:
>     [[[
>     public class DeadKeysFX extends Application {
>         @Override
>         public void start(Stage stage) {
>             TextField textField = new TextField();
>             Scene scene = new Scene(textField);
>             stage.setScene(scene);
>             stage.show();
>         }
>     }
>     ]]]
>
>     Just type ^+<space> and see whether you get one or two characters. In
>     all non-JavaFX programs (including Java Swing) I get a single '^'. In
>     JavaFX I get a '^ '.
>
>     --
>     Johan
>
>     On Tue, Sep 24, 2024 at 5:16 PM Thiago Milczarek Sayão
>     <thiago.sayao at gmail.com> wrote:
>     >
>     > Hi Johan,
>     >
>     > It might vary be platform. Which one are you using? (Windows,
>     Mac, Linux).
>     >
>     > Try disabling IME (Input Method Editor) and see it it works.
>     >
>     > - Thiago
>     >
>     > Em ter., 24 de set. de 2024 11:51, Johan Corveleyn
>     <jcorvel at gmail.com> escreveu:
>     >>
>     >> Hi,
>     >>
>     >> (This is my first post here, hope I'm following the right path)
>     >>
>     >> It seems JavaFX TextFields (and friends) do not automatically
>     convert
>     >> <dead key>+<space> into simply <dead key character>. They make
>     it into
>     >> <dead key character>+<space>, which is very atypical. I would
>     consider
>     >> this behavior a bug, since it is different from any editor I
>     know (and
>     >> makes it very hard to enter a dead key character on its own).
>     We ran
>     >> into this with Java 8, I also reproduced it with openjdk 21 +
>     openjfx
>     >> 23.
>     >>
>     >> For instance if in a JavaFX TextField I type a '^' keystroke,
>     it waits
>     >> for the next keystroke (which is normal since it's a dead key,
>     >> possibly followed by a character on which to put the '^'). But if I
>     >> then type <space> I expect a simple '^' to appear. Instead, in
>     JavaFX,
>     >> '^ ' appears. This does not happen in Swing, nor in any editor or
>     >> shell or ...
>     >>
>     >> Background context: a user of our JavaFX application couldn't
>     >> authenticate with their password (typed in a PasswordField).
>     After an
>     >> awful lot of troubleshooting we found that they used a '^' in their
>     >> password. Of course the user didn't notice that after typing
>     ^+space
>     >> two dots appeared in the PasswordField. Now that user knows
>     they have
>     >> to backspace after typing ^+space ...
>     >>
>     >> I suppose inserting a Swing JPasswordField in our JavaFX app would
>     >> work around this issue, but ... isn't there a better solution?
>     >> Shouldn't this be regarded as a bug?
>     >>
>     >> --
>     >> Johan
>
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