input/pointer: don't trigger pointer bindings for emulated input

Prior to this commit, a tablet device could trigger mouse button down
bindings if the pen was pressed on a surface that didn't bind tablet
handlers -- but it wouldn't if the surface did bind tablet handlers.

We should expose consistent behavior to users so that they don't have to
care about emulated vs. non-emulated input, so stop triggering bindings
for any non-pointer devices.

include/sway/input/cursor.h

@@ -91,7 +91,7 @@ void cursor_rebase_all(void);
 void cursor_update_image(struct sway_cursor *cursor, struct sway_node *node);
 
 void cursor_handle_activity(struct sway_cursor *cursor,
-	struct wlr_input_device *device);
+		struct wlr_input_device *device);
 void cursor_unhide(struct sway_cursor *cursor);
 int cursor_get_timeout(struct sway_cursor *cursor);
 

sway/input/cursor.c

@@ -256,21 +256,21 @@ int cursor_get_timeout(struct sway_cursor *cursor) {
 static enum sway_input_idle_source idle_source_from_device(
 		struct wlr_input_device *device) {
 	switch (device->type) {
-		case WLR_INPUT_DEVICE_KEYBOARD:
-			return IDLE_SOURCE_KEYBOARD;
-		case WLR_INPUT_DEVICE_POINTER:
-			return IDLE_SOURCE_POINTER;
-		case WLR_INPUT_DEVICE_TOUCH:
-			return IDLE_SOURCE_TOUCH;
-		case WLR_INPUT_DEVICE_TABLET_TOOL:
-			return IDLE_SOURCE_TABLET_TOOL;
-		case WLR_INPUT_DEVICE_TABLET_PAD:
-			return IDLE_SOURCE_TABLET_PAD;
-		case WLR_INPUT_DEVICE_SWITCH:
-			return IDLE_SOURCE_SWITCH;
-	}
-
-	assert(false);
+	case WLR_INPUT_DEVICE_KEYBOARD:
+		return IDLE_SOURCE_KEYBOARD;
+	case WLR_INPUT_DEVICE_POINTER:
+		return IDLE_SOURCE_POINTER;
+	case WLR_INPUT_DEVICE_TOUCH:
+		return IDLE_SOURCE_TOUCH;
+	case WLR_INPUT_DEVICE_TABLET_TOOL:
+		return IDLE_SOURCE_TABLET_TOOL;
+	case WLR_INPUT_DEVICE_TABLET_PAD:
+		return IDLE_SOURCE_TABLET_PAD;
+	case WLR_INPUT_DEVICE_SWITCH:
+		return IDLE_SOURCE_SWITCH;
+	}
+
+	abort();
 }
 
 void cursor_handle_activity(struct sway_cursor *cursor,