Most panel menus excluding main menus. Bind gsettings preference "menus have icons" to visibility of icon. Pack the icon into a box with a 16px min-width set in panel.css to hold the space when the icons are not shown Duplicate as much as possible behavior of now-deprecated GtkImageMenuItem replaced by github.com/mate-desktop/mate-panel/commit/86701517e7d7cb3d2c08a40d76af97308f18902c Use only one icon-settings gsettings object to control this in all menuitems controlled by panel-gtk.c The use of a single gsettings object is based on code by Albert Muktupavels https://github.com/muktupavels

* applet drag-handle: use a symbolic image for the default drag handle image
* Use an .svg image with --gtk-recolor (like a symbolic icon), load it from the same directory as the css file so the css parser can find it, and use the theme fg color on it for good contrast
* load a css file to use the recolorable image globally for the panel, not for each applet to ensure only one cssprovider is loaded

A setting is added to show the run dialog history in reverse.

A key has been added to the gsettings schema that controls history size.
The code of the run dialog has been changed to use that key.

- remove check for menubar schema as it's already installed along with panel itself
- properly unref menubar_settings object
- make key type unsigned
- drop obsolete MAX_ITEMS_OR_SUBMENU define