Make overlay icons themable

[ilya-fedin]

Sensor icons are taken from the current icon theme:

mate-sensors-applet/sensors-applet/sensors-applet.c

Lines 804 to 808 in 66f1050

	icon = gtk_icon_theme_load_icon(icon_theme,
	stock_icons[icon_type],
	DEFAULT_ICON_SIZE,
	GTK_ICON_LOOKUP_USE_BUILTIN,
	&error);

But overlay icons are hardcoded with /usr/share/pixmaps:

mate-sensors-applet/sensors-applet/active-sensor.c

Lines 49 to 55 in 4afada7

	static const gchar * const temp_overlay_icons[] = {
	PIXMAPS_DIR "very-low-temp-icon.png",
	PIXMAPS_DIR "low-temp-icon.png",
	PIXMAPS_DIR "normal-temp-icon.png",
	PIXMAPS_DIR "high-temp-icon.png",
	PIXMAPS_DIR "very-high-temp-icon.png"
	};

Can this be unhardcoded? 🤔

Expected behaviour

Sensor icon and its overlay is taken from the icon theme

Actual behaviour

Only sensor icon is taken from the icon theme

Steps to reproduce the behaviour

Install papirus-icon-theme

MATE general version

1.24.0

Package version

mate-sensors-applet-1.24.0

Linux Distribution

NixOS