Pasting an integer longer than 3 digits into custom donation field prevents modifying that number

[coreystone]

Guidelines

• I have searched searched open and closed issues for duplicates
• I am submitting a bug report for existing functionality that does not work as intended
• This isn't a feature request or a discussion topic

Bug description

I was testing #13876 and pasted an integer longer than 3 digits into the custom donation field (eg: 1111). Note that this number does not include a currency symbol like $. The app interprets the number properly, but I am unable to modify the number at all after pasting it - I cannot add or remove any digits. Pressing any number or the backspace key on the keyboard do not update the number. The solution is to hold and "select all" on the number which then fixes this issue, allowing for modifying the number as expected.

This does not occur when the number that is pasted includes a dollar sign like $1111.

Steps to reproduce

1. Settings > Donate to Signal > One-time
2. Copy and paste a number longer than 3 digits WITHOUT the $ or corresponding currency symbol (eg, 1111).
3. App interprets value correctly, but user unable to edit the value with keyboard.