Faster language switching

[PanderMusubi]

Checklist

• [X] I made sure that there are no existing issues - open or closed - to which I could contribute my information.
• [X] I made sure that there are no existing discussions - open or closed - to which I could contribute my information.
• [X] I have read the FAQs inside the app (Menu -> About -> FAQs) and my problem isn't listed.
• [X] I have taken the time to fill in all the required details. I understand that the bug report will be dismissed otherwise.
• [X] This issue contains only one feature request.
• [X] I have read and understood the contribution guidelines.
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Feature description

Faster language switching by swiping the space bar to left or right.

Why do you want this feature?

Most user use two languages, English and their native non-English language. Personally, I use four different language and I expect there are also a considerable amount of users that use three languages.

Currently, a long press on the key with the small globe icon is needed, followed by a press on the desired language. When writing in multiple languages, this should be offered in a much quicker way.

Additional information

In AnySoftKeyboard this is done with a special button (marked with the pink dot) that steps (only in one direction) to the next available language.

[PhilippKosarev]

I like being able to use the spacebar to move the cursor, so how about swiping up or down instead of left or right on the spacebar? This wouldn't impede any existing functionality while not requiring any additional buttons.

[PanderMusubi]

Sure, or make it configurable.

[AndyM48]

Or the option to add a language button Or a language button on the toolbar

[NaeemBolchhi]

I think a settings toggle could be added to move the Emoji key to the long-press effect of the Enter key. That would open up the language switch key for (1) a quick cycling through the enabled layouts on short-press, and (2) the current selection menu on long-press.

[PanderMusubi]

I would prefer anything without a long press as I switch languages so often. Long press is then annoying. For people writing in multiple languages chancing languages is used more often than e.g. a comma or quotation mark.

[ronniedroid]

I had submitted a PR (#40) to do this but it was rejected.

Made the keyboard unusable for me so I switched to FUTO Keyboard.