[FEATURE] When clicking shift with mousedown it should select several blocks

[Darginec05]

Is this a unique feature?

• [X] I have checked "open" AND "closed" issues and this is not a duplicate

Is your feature request related to a problem/unavailable functionality? Please describe.

Proposed Solution

Screenshots

No response

Do you want to work on this issue?

Yes

If "yes" to the above, please explain how you would technically implement this (issue will not be assigned if this is skipped)

No response