src/clfswm-internal.lisp (place-frames-from-xinerama-infos): handle better no xinerama support case.

src/clfswm.lisp (main-mode: configuer request): Call *root-size-change* hook on each root size change. This let CLFSWM refresh background wallpaper on root size changes.

src/clfswm-internal.lisp (place-frames-from-xinerama-infos): Handle root screen resize on the fly when adding or removing a monitor.

src/xlib-util.lisp (handle-event): Ignore synchronous xlib window-error and drawable-error in event handler. contrib/clfswm: Dump different image from different installation path.

src/clfswm.lisp (configure-request handler): Send a configuration notify event in a more precise way.

src/xlib-util.lisp (with-xlib-protect): Limit X errors ignored to prevent freezes and add a backtrace system.

src/clfswm.lisp (configure-request handler): To be ICCCM compliant, send a fake configuration notify event only when the window has moved and not when it has been resized.

src/clfswm-internal.lisp (delete-child-and-children-in-all-frames): Remove all children in frames and only close windows.

src/clfswm-internal.lisp (show-all-children): Hide only children hidden by normal windows or frames (but not :dialog, :transient...).

contrib/toolbar.lisp: Add a clickable label module for toolbar. Add a clickable entry to open the CLFSWM main menu. * src/clfswm-menu.lisp (open-menu): Prevent to reopen an opened menu. Fixe a but with negative selected-item.

contrib/toolbar.lisp (toolbar-module-text): Print a formatted text at module position centered in toolbar. src/xlib-util.lisp (optimize-event-hook): Remove unused event hooks.

src/xlib-util.lisp (handle-event): Add an additional hook event system to handle events in contrib code.