[FEATURE] Changes view improvements

[gigi81]

I wanted to suggest some improvements on the changes view:

• Add support for double click on a file to move to staged and back to unstaged if double click on a staged item
• Automatically select first item when opening changes view
• Automatically select next item in the list after staging an item
• The list of files on both staged/unstaged would be more user friendly as a tree instead of a list
• The code could use some refactoring in my opinion on this view and should be moved to the viewmodel so that same code can be used for button and doubleclick, maybe as a Command

Let me know what you think and you feel like you want to implement yourself. Happy to spend some time on it if myself you feel like something that can be eventually merged.

[love-linger]

You can change the display mode to List/Grid/Tree, and it will be saved into user's perference.

Since double click is a built-in action in TreeView to expand/collapse node, we use space on keyboard to stage/unstage selected changes in all the three display modes.

Code in Views.WorkingCopy is just used to get selected changes from different display mode, and then the interface of ViewModels.WorkingCopy can just concern about how to deal with the datas.

Automatic selection will not be added in the near future for some reasons:

• The TreeView control has no virtualization support. Currenty, if the number of data is greater than 50, all the tree nodes will be collapsed by default to avoid latency on loading. I'm considering replacing it with TreeDataGrid.
• The DiffView currently takes so much memory.

[gadfly3173]

Instead of staging/unstaging a file by double-clicking it, maybe consider adding a staging button to the right when hovering?

[love-linger]

Instead of staging/unstaging a file by double-clicking it, maybe consider adding a staging button to the right when hovering?

If there's horizontal scrollbar, it's hard to place the stage/unstage button

I perfer to use double-click after replace TreeView with TreeDataGrid, since the TreeDataGrid do not use double click to expand/collapse node by default.

[love-linger]

I've push a new branch feature/treedatagrid.

[gigi81]

Thanks @love-linger I didn't realise there was a button to change the view mode to three already. Thanks for looking into this. I will have a look at the branch and do some testing if that helps.