tkeyboard grab works on the dmenu window now (not on the root window) - thx for Kris for this hint - dmenu - Dmenu fork with xft fonts.
 (HTM) git clone git://r-36.net/dmenu
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       ---
 (DIR) commit d57c873f104cb8be34299efe70e02df4bf275d92
 (DIR) parent 724f72142f6dc880068a92e412f3f3366e643569
 (HTM) Author: Anselm R. Garbe <arg@suckless.org>
       Date:   Fri,  2 Mar 2007 21:48:48 +0100
       
       keyboard grab works on the dmenu window now (not on the root window) - thx for Kris for this hint
       Diffstat:
         main.c                              |      41 +++++++++++++++----------------
       
       1 file changed, 20 insertions(+), 21 deletions(-)
       ---
 (DIR) diff --git a/main.c b/main.c
       t@@ -110,7 +110,7 @@ drawmenu(void) {
        
        static void
        grabkeyboard(void) {
       -        while(XGrabKeyboard(dpy, root, True, GrabModeAsync,
       +        while(XGrabKeyboard(dpy, win, True, GrabModeAsync,
                                 GrabModeAsync, CurrentTime) != GrabSuccess)
                        usleep(1000);
        }
       t@@ -454,24 +454,6 @@ main(int argc, char *argv[]) {
                        eprint("dmenu: cannot open display\n");
                screen = DefaultScreen(dpy);
                root = RootWindow(dpy, screen);
       -        if(isatty(STDIN_FILENO)) {
       -                maxname = readstdin();
       -                grabkeyboard();
       -        }
       -        else { /* prevent keypress loss */
       -                grabkeyboard();
       -                maxname = readstdin();
       -        }
       -        /* init modifier map */
       -        modmap = XGetModifierMapping(dpy);
       -        for (i = 0; i < 8; i++) {
       -                for (j = 0; j < modmap->max_keypermod; j++) {
       -                        if(modmap->modifiermap[i * modmap->max_keypermod + j]
       -                        == XKeysymToKeycode(dpy, XK_Num_Lock))
       -                                numlockmask = (1 << i);
       -                }
       -        }
       -        XFreeModifiermap(modmap);
                /* style */
                dc.norm[ColBG] = initcolor(normbg);
                dc.norm[ColFG] = initcolor(normfg);
       t@@ -495,6 +477,25 @@ main(int argc, char *argv[]) {
                XSetLineAttributes(dpy, dc.gc, 1, LineSolid, CapButt, JoinMiter);
                if(!dc.font.set)
                        XSetFont(dpy, dc.gc, dc.font.xfont->fid);
       +        drawmenu();
       +        XMapRaised(dpy, win);
       +        if(isatty(STDIN_FILENO)) {
       +                maxname = readstdin();
       +                grabkeyboard();
       +        }
       +        else { /* prevent keypress loss */
       +                grabkeyboard();
       +                maxname = readstdin();
       +        }
       +        /* init modifier map */
       +        modmap = XGetModifierMapping(dpy);
       +        for(i = 0; i < 8; i++)
       +                for(j = 0; j < modmap->max_keypermod; j++) {
       +                        if(modmap->modifiermap[i * modmap->max_keypermod + j]
       +                        == XKeysymToKeycode(dpy, XK_Num_Lock))
       +                                numlockmask = (1 << i);
       +                }
       +        XFreeModifiermap(modmap);
                if(maxname)
                        cmdw = textw(maxname);
                if(cmdw > mw / 3)
       t@@ -505,8 +506,6 @@ main(int argc, char *argv[]) {
                        promptw = mw / 5;
                text[0] = 0;
                match(text);
       -        XMapRaised(dpy, win);
       -        drawmenu();
                XSync(dpy, False);
        
                /* main event loop */