Add altgr to the list of guarded modifiers (#378)

src/keyboard.c

@@ -112,7 +112,8 @@ static void set_mods(struct keyboard *kbd, uint8_t mods)
 			 * additional control sequences.
 			 */
 			int guard = ((((kbd->last_pressed_output_code == KEYD_LEFTMETA) && mask == MOD_SUPER) ||
-					((kbd->last_pressed_output_code == KEYD_LEFTALT) && mask == MOD_ALT)) &&
+					((kbd->last_pressed_output_code == KEYD_LEFTALT) && mask == MOD_ALT) ||
+					((kbd->last_pressed_output_code == KEYD_RIGHTALT) && mask == MOD_ALT_GR)) &&
 				    !kbd->inhibit_modifier_guard &&
 				    !kbd->config.disable_modifier_guard);
 

t/altgr-modifier-guard.t

@@ -0,0 +1,27 @@
+rightalt down
+a down
+a up
+rightalt up
+rightalt down
+rightalt up
+rightalt down
+x down
+x up
+rightalt up
+
+rightalt down
+control down
+rightalt up
+control up
+a down
+a up
+rightalt down
+control down
+rightalt up
+control up
+rightalt down
+rightalt up
+rightalt down
+x down
+x up
+rightalt up

t/test.conf

@@ -43,6 +43,10 @@ o = overloadt(control, a, 10)
 \ = 😄
 [ = togglem(control, macro(one))
 
+[altgr]
+
+a = a
+
 [layout2:layout]
 
 a = c