net/freerdp: add workaround for focus bug of WM

Some WMs (for example fvwm and fluxbox) intermittently steal focus
during attempts to drag something with the mouse on the remote machine,
effectively making it impossible to drag. This behavior seems to also
depend on the configuration of the WM.

Add an optional patch to work around this problem, activated by the new
option BROKENFOCUS. Note that this workaround may lead to a wrong state
of keyboard modifiers after focus changes, so only enable if if you
really need to.

PR:	254908
Approved by:	VVD <vvd@unislabs.com> (maintainer)

net/freerdp/Makefile

@@ -39,8 +39,9 @@ CMAKE_OFF=	WITH_DSP_EXPERIMENTAL WITH_GPROF WITH_GSTREAMER_0_10 WITH_IPP \
 CMAKE_ARGS_aarch64+=	-DWITH_NEON=ON
 CFLAGS_aarch64+=	-D__ARM_NEON__=__ARM_NEON # clang
 
-OPTIONS_DEFINE=		ALSA CUPS FAAC FAAD FFMPEG GSM GSTREAMER ICU JPEG KERBEROS \
-			LAME MANPAGES OPENH264 PCSC PULSEAUDIO SOXR WAYLAND X11
+OPTIONS_DEFINE=		ALSA BROKENFOCUS CUPS FAAC FAAD FFMPEG GSM GSTREAMER \
+			ICU JPEG KERBEROS LAME MANPAGES OPENH264 PCSC \
+			PULSEAUDIO SOXR WAYLAND X11
 OPTIONS_DEFAULT=	CUPS GSTREAMER ICU KERBEROS MANPAGES SWSCALE WAYLAND X11
 OPTIONS_RADIO=		SCALE
 OPTIONS_RADIO_SCALE=	CAIRO SWSCALE
@@ -55,6 +56,9 @@ OPTIONS_DEFAULT_amd64=	SSE
 ALSA_LIB_DEPENDS=	libasound.so:audio/alsa-lib
 ALSA_CMAKE_BOOL=	WITH_ALSA
 
+BROKENFOCUS_DESC=	Work around focus bug in some WMs (PR \#254908)
+BROKENFOCUS_EXTRA_PATCHES=	${PATCHDIR}/extra-patch-focusbug.diff
+
 CAIRO_DESC=		Use CAIRO image library for screen resizing
 CAIRO_LIB_DEPENDS=	libcairo.so:graphics/cairo
 CAIRO_CMAKE_BOOL=	WITH_CAIRO

net/freerdp/files/extra-patch-focusbug.diff

@@ -0,0 +1,10 @@
+--- client/X11/xf_keyboard.c.orig	2021-09-02 06:23:36 UTC
++++ client/X11/xf_keyboard.c
+@@ -183,7 +183,6 @@ void xf_keyboard_release_all_keypress(xfContext* xfc)
+ 			xfc->KeyboardState[keycode] = FALSE;
+ 		}
+ 	}
+-	xf_sync_kbd_state(xfc);
+ }
+ 
+ BOOL xf_keyboard_key_pressed(xfContext* xfc, KeySym keysym)