Autocomplete text - system wide?

I would like to have some autocomplete text function like Android has, but I don’t know any linux alternative that would be possible to use, or can be actively turned on/off where is needed. Any idea? TIA

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If I understand you correctly, the ibus typing booster is what you are looking for. It provides suggestions, which can be enabled/disabled in its settings:

In fact, here’s the website with a screencast: