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Disable transient symbols for compose and dead keys in GTK programs

[An article in the GTK blog][3] explains the situation very well, but here is my go at it.

In my keyboard layout, accents are handled as [dead keys][2], so to insert "ë", first I type `¨` and then `e`. Nothing happens on the screen until the very last step, at which point `ë` is inserted.

That, however, recently changed in all my GTK3 programs: An underlined meta-character is displayed when a dead key is pressed. E.g., when I type `¨`, I see an underlined diaeresis:  
![Meta-character displayed when pressing ¨](https://linux.codidact.com/uploads/AwXKDKVCHu4xeBCR8JwrZWPr)

Of course, that transient character goes away once I complete the sequence by pressing `e`, but I find the new behavior confusing because for years I have been used not to see any character until after the key sequence was complete. Now it just looks like I have fat-fingered — not to mention some misbehavior that may occur in some programs when backspacing.

The same happens when using a [compose sequences][1].

Thus the question: **How can I disable transient symbols for compose and dead keys and revert back to the good, old behavior?**

[1]: https://en.wikipedia.org/wiki/Compose_key
[2]: https://en.wikipedia.org/wiki/Dead_key 
[3]: https://blog.gtk.org/2021/03/24/input-revisited/