The start frame text input does not accept any number over 99 in the animation panel. Trying to add any more numbers just refuses input.  

I noticed the same bug in the 2.9.9 animation beta as well. 

Reproducible: Always

Steps to Reproduce:
1. Create an animation with more than 100 frames.
2. Open the animation panel, and try to set a 3+ digit number.
3. The first two digits are accepted, but the text input does not respond from the third digit onwards. 

Actual Results:  
Krita only accepts two digit numbers for start frames. The latest start frame Krita starts at is at frame 99, the largest two digit number possible. 

Expected Results:  
The start frame should be able to be set as any number smaller than the end frame. 

On Windows 10 64 bits version 1151
On Wacom Intuos 5 Small