Allow multi selection of Spots in TrackScheme Window with Keyboard

[stefanhahmann]

User Story

As a user I would like to be able to select multiple spots in the TrackScheme Window using the Key combination Ctrl+Shift + Up, Down, Right, Left.
I would like to do so, because in some situation, I would like to select Spots from exactly timepoint (e.g.) 30 up to excatly timepoint (e.g.) 60.

Currently, I can draw a box to select multiple Spots. However, it is difficult to match an exact timepoint, when the project is large:

Or, I can select a single Spot and the press Shitf + Up, Down, Right, Left leading to this selection behaviour (note that while pressing + in the right row does only select the Spots in that rows, but not in the previously selected rows):

I would like to have the Selection with Ctrl+Shift + Up, Down, Right, Left to work like in Excel Spread Sheet:

This behaviour would allow me to make precise selections of spots regarding timepoints.

[tinevez]

Looks good, but could you instead add a new action that does that, with a different keybinding? I would like to keep the shift+arrow behavior.

[stefanhahmann]

Looks good, but could you instead add a new action that does that, with a different keybinding? I would like to keep the shift+arrow behavior.

Okay. I modified the issue. Any suggestion, which keybinding should be used for this?

[tinevez]

Maybe Ctrl+Shift+arrows?

[stefanhahmann]

Maybe Ctrl+Shift+arrows?

Updated the issue.