[Gtk4] Support MenuItem images on GTK4 - #3441
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GtkModelButton (GTK4's native menu row) never shows both an icon and text, so PUSH menu items with images rendered without their icon. Work around this by embedding a custom icon+label(+accelerator) GtkButton into the popover via gtk_popover_menu_add_child() for PUSH items. CASCADE, CHECK and RADIO items keep the native GtkModelButton, since GTK ties their submenu link / selection indicator to it and there is no way to reproduce that in a custom widget. Injection is self-healing: GTK's "custom" ids are single-use once their placeholder slot is destroyed (e.g. by menu repopulation), so a detached widget is re-injected under a fresh id rather than reusing the stale one, which previously left dynamically-rebuilt items (like Run/Debug) invisible. Fixes eclipse-platform#2511 Assisted-by: Anthropic Claude Code (claude-sonnet-5)
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GtkModelButton (GTK4's native menu row) never shows both an icon and text, so PUSH menu items with images rendered without their icon. Work around this by embedding a custom icon+label(+accelerator) GtkButton into the popover via gtk_popover_menu_add_child() for PUSH items.
CASCADE, CHECK and RADIO items keep the native GtkModelButton, since GTK ties their submenu link / selection indicator to it and there is no way to reproduce that in a custom widget.
Injection is self-healing: GTK's "custom" ids are single-use once their placeholder slot is destroyed (e.g. by menu repopulation), so a detached widget is re-injected under a fresh id rather than reusing the stale one, which previously left dynamically-rebuilt items (like Run/Debug) invisible.
WIP towards #2511