fix: disable row drag and drop while loading

[tomivirkki]

Fixes #2896

[hdamr]

I tested the map application with new changes and error was gone, I also ran the tests locally and they were passing, and they failed when the change was reverted.

[DiegoCardoso]

Also tested with the sample application and was able to see why the error happens.
💯

[sonarcloud]

Kudos, SonarCloud Quality Gate passed!   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
1 Code Smell

No Coverage information
0.0% Duplication

[vaadin-bot]

Hi @tomivirkki , this commit cannot be picked to 21.0 by this bot, can you take a look and pick it manually?
Error Message: Error: Command failed: git cherry-pick d334ed4
warning: inexact rename detection was skipped due to too many files.
warning: you may want to set your merge.renamelimit variable to at least 3759 and retry the command.
error: could not apply d334ed4... fix: disable row drag and drop while loading (#2957)
hint: after resolving the conflicts, mark the corrected paths
hint: with 'git add ' or 'git rm '
hint: and commit the result with 'git commit'

[vaadin-bot]

This ticket/PR has been released with platform 22.0.0.beta2 and is also targeting the upcoming stable 22.0.0 version.