Letter spacing clamps to -100 to 100 pixels instead of being unlimited

Summary:

When adding text and changing the letter-spacing property, this is limited at 100px in negative or positive directions. When you have a very large document, e.g. 4000x4000, only 100px of letter-spacing is not enough. This should not be limited in this way.

Steps to reproduce:

• Open Inkscape
• Use the text tool to type some text
• Select all text and apply letter spacing of more than 100px
• See the letter-spacing being clamped at 100px instead of keeping a higher value

What happened?

Letter-spacing gets clamped within -100 and 100.

What should have happened?

Value should stay at entered value, e.g. 250px.

Version Info:

- Inkscape Version: 1.0.2 (e86c870879, 2021-01-15, custom)
- Operating System: Windows
- Operating System version: Win10 1909 (18363.1500)