Add "CopyToClipboard" command to ConfirmationController

[kyu08]

PR Description

Sometimes, I want to copy the error message to clipboard to search google or ask to LLM about the error message.

So I added CopyToClipboard command to ConfirmationController and I have confirmed that this command copies the content of the window to the clipboard.

Please check if the PR fulfills these requirements

• Cheatsheets are up-to-date (run go generate ./...)
• Code has been formatted (see here)
• Tests have been added/updated (see here for the integration test guide)
• Text is internationalised (see here)
• If a new UserConfig entry was added, make sure it can be hot-reloaded (see here)
• Docs have been updated if necessary
• You've read through your own file changes for silly mistakes etc

[stefanhaller]

Nice, seems useful.

Two things:

• there's no feedback when pressing the key; usually we show a toast in the status line, but apparently toasts are suppressed when a popup is showing? Would have to investigate why, or if it's possible to change that.
• I feel the <c-o> keybinding should not be between enter and esc, but to the right of esc, which is by far the more important key to know about. However, then it ends up between the two esc bindings, so that would have to be solved first.

[kyu08]

Thanks for the feedback!

• there's no feedback when pressing the key; usually we show a toast in the status line, but apparently toasts are suppressed when a popup is showing? Would have to investigate why, or if it's possible to change that.

I'll look into it.

• I feel the keybinding should not be between enter and esc, but to the right of esc, which is by far the more important key to know about.

That's right! This is fixed in e7505c4.

However, then it ends up between the two esc bindings, so that would have to be solved first.

So how about adding an implementation like this first, then merging this PR, and then deleting unnecessary key bindings?

[kyu08]

• there's no feedback when pressing the key; usually we show a toast in the status line, but apparently toasts are suppressed when a popup is showing? Would have to investigate why, or if it's possible to change that.

I found the cause. self.c.OS().CopyToClipboard(text) does not simply call the Toast() method .
So it might be fine to just call it in the Handler.
Fixed in 494edfc.