Crash using color picker/dropper (too much)
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#### Steps to reproduce:
<!-- Describe what you did (step-by-step) so we can reproduce: -->
- open Inkscape
- use the dropper a lot
#### What happened?
It crashes the program
Backtrace from another user attached here: https://gitlab.com/inkscape/inbox/uploads/f8fff58b2cb59baa0206b31eaa8b4c0c/inkscape_backtrace.txt
See https://gitlab.com/inkscape/inbox/-/issues/2610#note_346351632
> It has occurred across two seperate files the first is 26.7KB file and the second is 26.3 KB. The crash seems to be triggered by heavy use of the dropper tool, as I did not have a single crash before using the dropper tool on the first file.
> The crash is often preceded by the disappearance of the dropper cursor, replaced by the default Windows cursor. I use the keyboard shortcut "d" almost exclusively to access the dropper.
#### Inkscape Version and Operating System:
- Inkscape Version: 1.0rc1
- Operating System: Windows 10
- Operating System version: 10.0.18362
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