[v2] Files DragAndDrop bugs

Description

1. When only EnableFileDrop: true, every time D'n'D happens an OnDomReady is triggered.

INF | drop files: []string{"/abs/path/file.txt"}
WTF?
main.(*App).onFileDrop
        .../app.go:125
github.com/wailsapp/wails/v2/pkg/runtime.OnFileDrop.func1
        github.com/wailsapp/wails/v2@v2.9.1/pkg/runtime/draganddrop.go:30
runtime.goexit
        $GOROOT/src/runtime/asm_amd64.s:1598
INF | DOM READY -------------------------------
WTF?
main.(*App).domReady
        .../app.go:104
github.com/wailsapp/wails/v2/internal/frontend/desktop/linux.(*Frontend).processMessage
        github.com/wailsapp/wails/v2@v2.9.1/internal/frontend/desktop/linux/frontend.go:411
github.com/wailsapp/wails/v2/internal/frontend/desktop/linux.(*Frontend).startMessageProcessor
        github.com/wailsapp/wails/v2@v2.9.1/internal/frontend/desktop/linux/frontend.go:215
runtime.goexit
        $GOROOT/src/runtime/asm_amd64.s:1598

2. When EnableFileDrop: true, DisableWebViewDrop: true, D'n'D don't work for files ever. Not sure how this option should be used. I hoped it should prevent p.1 above to happen. (enhance usage documentation)

To Reproduce

import "github.com/pkg/errors"

func (a *App) domReady(ctx context.Context) {
    runtime.OnFileDropOff(ctx)
    runtime.LogInfof(ctx, "DOM READY -------------------------------\n%+v", errors.New("WTF?"))
    runtime.OnFileDrop(ctx, a.onFileDrop)
}

func (a *App) onFileDrop(x, y int, paths []string) {
    runtime.LogInfof(a.ctx, "drop files: %#v\n%+v", paths, errors.New("WTF?"))
}

Expected behaviour

1. No extra OnDomReady triggering
2. Better documentation how these options works at they own and together.

Screenshots

No response

Attempted Fixes

No response

System Details

# Wails

Version         | v2.9.1
Package Manager | apt   

(v2.9.2 as well - UPD 2024-10-05)

System

┌──────────────────────────────────────────────────────────────────────────────────┐
| OS           | Ubuntu                                                            |
| Version      | 22.04                                                             |
| ID           | ubuntu                                                            |
| Go Version   | go1.20.5                                                          |
| Platform     | linux                                                             |
| Architecture | amd64                                                             |
| CPU          | AMD Ryzen 9 7950X 16-Core Processor                               |
| GPU          | unknown (Advanced Micro Devices, Inc. [AMD/ATI]) - Driver: amdgpu |
| Memory       | 59GB                                                              |
└──────────────────────────────────────────────────────────────────────────────────┘

Dependencies

┌──────────────────────────────────────────────────────────────────────────┐
| Dependency | Package Name          | Status    | Version                 |
| *docker    | docker.io             | Available | 24.0.7-0ubuntu2~22.04.1 |
| gcc        | build-essential       | Installed | 12.9ubuntu3             |
| libgtk-3   | libgtk-3-dev          | Installed | 3.24.33-1ubuntu2.1      |
| libwebkit  | libwebkit2gtk-4.0-dev | Installed | 2.44.2-0ubuntu0.22.04.1 |
| npm        | npm                   | Installed | 10.2.4                  |
| *nsis      | nsis                  | Installed | v3.08-2                 |
| pkg-config | pkg-config            | Installed | 0.29.2                  |
└──────────────────────── * - Optional Dependency ─────────────────────────┘

Additional context

No response

Read pkg/runtime/draganddrop.go and the Linux message handling in internal/frontend/desktop/linux/frontend.go, then reproduce both configurations from the issue. Trace how EnableFileDrop and DisableWebViewDrop interact with OnFileDrop and OnDomReady; done means file drops work without an extra DOM-ready event and the option behavior is documented.