C#: Redesign MSBuild panel

[raulsntos]

• Depends on Expose the TabBar of a TabContainer #80227 or Allow adding buttons to the TabContainer header #80301.
• Redesign panel to look closer to the look of other Godot panels such as Output and Debugger.
• Moved list of problems and output log to separate tabs instead of using a HSplit.
• Added Tree/List layouts to the problems tab.
• Added search box to filter problems tab.
• Added FileTree icon, made from FileList. Both are used for the button that toggles the Tree/List layouts.

4.1 stable	This PR
Before	Problems tab (List view)
	Problems tab (Tree view)
	Output tab

[YuriSizov]

This can now be finished on top of #80227. Would love to have this in 4.2 🙂

[YuriSizov]

Is the first item supposed to be empty? I guess it has to do with the "Unknown file" thing, but perhaps can be handled a bit nicer, with some text?

[YuriSizov]

You need to replace Flat = true with theme type variation FlatButton, so it has a nice pressed state.

[YuriSizov]

I also noticed that you have a couple of your own dialogs, including an error dialog. First of all, you could use EditorNode::show_warning, probably. If you can't or you want to have more controlled and complex dialogs that you create yourself, you need to create them with set_unparent_when_invisible(true) and use EditorInterface::popup_* methods to pop them up. Without that your dialogs cause "Transient parent has another exclusive child.".

(Also there is this strange error that I got from creating a new C# script in the editor, it throws trying to call callp for some reason. I haven't investigated it further, as I doubt it's related to this PR.)

[YuriSizov]

These are pretty minor problems, overall it all seems very nice!

[raulsntos]

I tried using set_unparent_when_invisible(true) and EditorInterface::popup_* but the dialog disappears immediately and the next time there's an error ERROR: Attempting to parent and popup a dialog that already has a parent. In any case it wouldn't be related to this PR, we've been using those dialogs for a while.

[akien-mga]

Thanks!

[YuriSizov]

I tried using set_unparent_when_invisible(true) and EditorInterface::popup_* but the dialog disappears immediately and the next time there's an error ERROR: Attempting to parent and popup a dialog that already has a parent.

That's weird. Make sure you don't parent it manually to anything, the popup methods handles that.

[raulsntos]

@YuriSizov It seems it's because of ProgressDialog::hide. The ProgressDialog::end_task is executed after we open the build error dialog. Maybe we should end the task before we show the error dialog, but also is this behavior expected? I mean if hiding ProgressDialog should also hide other dialogs.