Display available keyboard shortcuts in context menus

[Thomas1664]

Fixes #1492
Fixes #873

[yaira2]

Can you check if this causes the event to be fired twice?

[Thomas1664]

Can you check if this causes the event to be fired twice?

The event is only invoked once either using keyboard shortcut or the actual menu item

[tsvietOK]

Bug: Can't rename file in GridView mode.
Steps:

1. Select file and press F2.
2. Click on empty space or press Enter.
3. Crash

[Thomas1664]

@tsvietOK This issue occurs on master as well.
More precise steps to reproduce:

1. Switch to grid view
2. Select an item
3. Press F2 to rename
4. Rename the item
5. Switch to tiles view
6. Rename the same item again by selecting it and pressing F2
7. Switch back to grid view
8. Select the same item
9. Press F2 to rename
10. See error

[tsvietOK]

Can't reproduce your issue.

[Thomas1664]

@tsvietOK If you referred to a dialog box popping up saying that you can't have 2 files with the same name, this appears in master as well.

[tsvietOK]

No, i can't reproduce your issue at all. I am able to rename files without any problem on master branch.

[tsvietOK]

Issue i mentioned before still exists with your changes.

[Thomas1664]

@tsvietOK And I can't reproduce any issue you have.

[Thomas1664]

@tsvietOK This commit might fix your issue (at least it fixes mine)

[tsvietOK]

Issue reported by me still present.

[Thomas1664]

I still have no crash. How should we continue since I can't reproduce your crash after renaming a file?

[tsvietOK]

[tsvietOK]

This is due to the double call of the event.

[Thomas1664]

Hey, how are you? I a new at this whole coding business. . . But was wondering, is there a way to set "Files - preview" as the default file explorer? And how can I change the icon, as I was able to do it with all my other apps by using properties but it doesn't seem to work with yours. . . Thanks so much and keep it up!

@coheneli98 Please don't ask questions like this in PRs. File an issue or use Discord instead!

[tsvietOK]

Can't delete file.
Steps:

1. Open GridView mode
2. Select file
3. Press Delete button
4. Crash

[tsvietOK]

Now Delete button is not working in ListView mode.

[Thomas1664]

@tsvietOK I can't reproduce a bug with the delete item in context menu. A screenshot would be helpful.

[tsvietOK]

I am talking about Delete button on your keyboard.

[tsvietOK]

When paste file it shows several copies of these files(PasteItem() called twice), but it fixes when pressing F5.

[Thomas1664]

@tsvietOK Please check if there are any other issues in this PR so I can fix them all at once.

[tsvietOK]

@Thomas1664 Sure

[tsvietOK]

"Cut item" called twice.

[tsvietOK]

"Copy item" called twice.