[Epic] [macos][arm64] Tracking GtkSharp issues affecting Skia/Gtk

[spouliot]

Current behavior

The latest release of GtkSharp has some issues on macOS/arm64 (M1). This issue tracks the issues: found / fixed / released affecting this configuration.

• Fix loading native libraries on macOS (arm64) using homebrew installed gtk+3 GtkSharp/GtkSharp#344
  This affects application startup (native libraries can't be found)
• [glib] Fix g_filename_[from|to]_utf8 signatures for 64 bits platforms GtkSharp/GtkSharp#346
  This affects native file dialogs

Expected behavior

An Uno app running on Skia/Gtk on an arm64-based Mac should behave identically as running on x86_64 Mac computer.

How to reproduce it (as minimally and precisely as possible)

Run Uno Skia/Gtk apps on an arm64-based Mac.

Workaround

Use the HEAD of the develop branch of GtkSharp.

Works on UWP/WinUI

No response

Environment

Uno.UI / Uno.UI.WebAssembly / Uno.UI.Skia

NuGet package version(s)

No response

Affected platforms

Skia (GTK on Linux/macOS/Windows)

IDE

No response

IDE version

No response

Relevant plugins

No response

Anything else we need to know?

Some issues could also exists on other arm64 platforms (linux or windows).

[jeromelaban]

Thanks!

[MartinZikmund]

@spouliot Can this be closed?

[spouliot]

@MartinZikmund no, I would left it open for reference. My fixes are merged but they were never released so the issues remain (unless you build gtk# yourself).