[GUI] Limit amount to 8 decimal digits

[pythcoiner]

fixes #798

[jp1ac4]

I'm wondering if this should rather be done at the form level, similarly to how we trim whitespaces:

liana/gui/ui/src/component/form.rs

Line 53 in 903328f

pub fn new_trimmed<F>(placeholder: &str, value: &Value<String>, on_change: F) -> Self

E.g. we could add new_amount_btc() that trims any excess decimals before passing the value to the on_change function.

[pythcoiner]

I'm wondering if this should rather be done at the form level, similarly to how we trim whitespaces:

liana/gui/ui/src/component/form.rs

Line 53 in 903328f

pub fn new_trimmed<F>(placeholder: &str, value: &Value<String>, on_change: F) -> Self

E.g. we could add new_amount_btc() that trims any excess decimals before passing the value to the on_change function.

i'll look into this, also i think we can filter out char other then "0123456789." and maybe automaticaly replace , by . ?

[pythcoiner]

deprecated in favor of #992, following @jp1ac4 advice