code: drawterm

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gui-x11: simpler attempt on handling alt-compose cancel on window focus change

on some linux window managers, people switch focus with alt+[tab]
or alt+[123] which causes drawterm to see [alt] down, [alt] up
which starts a compose sequence.

we solve this by handling window focus change events, and send
a second alt press/release when alt was hold down.

--- a/gui-x11/x11.c

+++ b/gui-x11/x11.c

@@ -302,6 +302,9 @@

 		Button4MotionMask|

 		Button5MotionMask|

 		ExposureMask|

+		EnterWindowMask|

+		LeaveWindowMask|

+		FocusChangeMask|

 		StructureNotifyMask;

 	XSelectInput(xkmcon, xdrawable, mask);

@@ -727,15 +730,25 @@

 static void

 xkeyboard(XEvent *e)

 {

+	static int altdown;

 	KeySym k;

-	/*

-	 * I tried using XtGetActionKeysym, but it didn't seem to

-	 * do case conversion properly

-	 * (at least, with Xterminal servers and R4 intrinsics)

-	 */

-	if(e->xany.type != KeyPress && e->xany.type != KeyRelease)

+	switch(e->xany.type){

+	case KeyPress:

+	case KeyRelease:

+		break;

+	case FocusIn:

+	case FocusOut:

+		if(altdown){

+			altdown = 0;

+			kbdkey(Kalt, 0);

+			kbdkey(Kalt, 1);

+			kbdkey(Kalt, 0);

+		}

+		/* wet floor */

+	default:

 		return;

+	}

 	XLookupString((XKeyEvent*)e, NULL, 0, &k, NULL);

@@ -866,10 +879,9 @@

 	/* Do control mapping ourselves if translator doesn't */

 	if(e->xkey.state&ControlMask && k != Kalt && k != Kctl)

 		k &= 0x9f;

-	if(k == NoSymbol) {

+	if(k == NoSymbol)

 		return;

-	}

-

+	altdown = e->xany.type == KeyPress && k == Kalt;

 	kbdkey(k, e->xany.type == KeyPress);

 }