[VDG] Send View - BTC and Fiat currency inputs

[ichthus1604]

• Enables typing on both the BTC and the fiat inputs in the send screen
• User preference is persisted in UI config

[yahiheb]

This looks very promising.

[MaxHillebrand]

Yes, this is great, it addresses #5165

[MaxHillebrand]

tested 12e26bd

sometimes, clicking the switch button does not switch it, not sure exactly why, but I can sometimes reproduce.

also, when it switches, it highlights/selects the left amount, probably better to just put the courser there.

Dan mentioned to make it look like a single textbox, but I think I would prefer how it currently is with two distinct text boxes.

Also add the wave icon "is roughly" always before the fiat option.

[ichthus1604]

Latest commit includes visual improvements, and the control's readonly state template, which wasn't properly designed before

@MaxHillebrand can't reproduce the button issue. clicking swaps every time for me.

also, when it switches, it highlights/selects the left amount, probably better to just put the courser there

This is the default behavior of the currency entry, also I think it's good ux, because if you're swapping that means you probably want to enter the exact right side amount specifically

Also add the wave icon "is roughly" always before the fiat option.

Should be there already?

[ichthus1604]

@MaxHillebrand latest commit adds ~ symbol to the fiat watermark, maybe that's what you were seeing?

[MaxHillebrand]

tACK 585c078

looks great now - cannot reproduce that earlier described bug.

[yahiheb]

LGTM

[soosr]

tACK

#7690 (comment)

[soosr]

tACK

[MaxHillebrand]

tACK eed9091

Looks pretty and it's a wonderful solution that combines both possible UX approaches.

Very well done!

[SuperJMN]

tACK.
I took special attention to the code. I've not seen any noticeable problem in it. It's quite clear and readable.

Good work @ichthus1604!