Can't move more than one task at once, making managing Inbox tedious

[axelsimon]

Describe the bug
It is not possible to move more than one task at a time from "Inbox" to a given project.

To Reproduce

1. Click on the 3 vertical dots, chose "Select"
2. Select multiple items / tasks
   2.1. Discover there is no option to "Select all"
3. Look at the contextual menu that appeared at the bottom of the interface, find no "Move tasks" option
4. Right-click, use the "Move" action, discover that it only applies to the task on which the right-click was done, not all the selected tasks

Expected behavior
There should be an obvious, straightforward way to mass move tasks around.

Screenshots
If applicable, add screenshots to help explain your problem.

Desktop (please complete the following information):

• OS or DE: Gnome
• Version: 4.11.6

Additional context
This issue really goes against the idea of having an "Inbox" in the first place: if you have to manually move every single task from Inbox to another project, you might as well just create the tasks in the right project in the first place or not bother and just keep everything in the Inbox forever.