input/keyboard: don't reset layout for same keymap

In sway_keyboard_config, do not change the keymap when the new keymap
is unchanged, unless this is during a config reload. The reasoning for
this is to prevent the effective layout from being reset to index 0 for
input config changes unrelated to the keymap.

sway/input/keyboard.c

@@ -622,34 +622,42 @@ void sway_keyboard_configure(struct sway_keyboard *keyboard) {
 		keymap_changed = true;
 	}
 
-	xkb_keymap_unref(keyboard->keymap);
-	keyboard->keymap = keymap;
-	keyboard->effective_layout = 0;
-	wlr_keyboard_set_keymap(wlr_device->keyboard, keyboard->keymap);
-
-	xkb_mod_mask_t locked_mods = 0;
-	if (input_config && input_config->xkb_numlock > 0) {
-		xkb_mod_index_t mod_index = xkb_map_mod_get_index(keymap, XKB_MOD_NAME_NUM);
-		if (mod_index != XKB_MOD_INVALID) {
-		       locked_mods |= (uint32_t)1 << mod_index;
+	if (keymap_changed || config->reloading) {
+		xkb_keymap_unref(keyboard->keymap);
+		keyboard->keymap = keymap;
+		keyboard->effective_layout = 0;
+		wlr_keyboard_set_keymap(wlr_device->keyboard, keyboard->keymap);
+
+		xkb_mod_mask_t locked_mods = 0;
+		if (input_config && input_config->xkb_numlock > 0) {
+			xkb_mod_index_t mod_index = xkb_map_mod_get_index(keymap,
+					XKB_MOD_NAME_NUM);
+			if (mod_index != XKB_MOD_INVALID) {
+			       locked_mods |= (uint32_t)1 << mod_index;
+			}
 		}
-	}
-	if (input_config && input_config->xkb_capslock > 0) {
-		xkb_mod_index_t mod_index = xkb_map_mod_get_index(keymap, XKB_MOD_NAME_CAPS);
-		if (mod_index != XKB_MOD_INVALID) {
-		       locked_mods |= (uint32_t)1 << mod_index;
+		if (input_config && input_config->xkb_capslock > 0) {
+			xkb_mod_index_t mod_index = xkb_map_mod_get_index(keymap,
+					XKB_MOD_NAME_CAPS);
+			if (mod_index != XKB_MOD_INVALID) {
+			       locked_mods |= (uint32_t)1 << mod_index;
+			}
 		}
-	}
-	if (locked_mods) {
-		wlr_keyboard_notify_modifiers(wlr_device->keyboard, 0, 0, locked_mods, 0);
-		uint32_t leds = 0;
-		for (uint32_t i = 0; i < WLR_LED_COUNT; ++i) {
-			if (xkb_state_led_index_is_active(wlr_device->keyboard->xkb_state,
-					wlr_device->keyboard->led_indexes[i])) {
-				leds |= (1 << i);
+		if (locked_mods) {
+			wlr_keyboard_notify_modifiers(wlr_device->keyboard, 0, 0,
+					locked_mods, 0);
+			uint32_t leds = 0;
+			for (uint32_t i = 0; i < WLR_LED_COUNT; ++i) {
+				if (xkb_state_led_index_is_active(
+						wlr_device->keyboard->xkb_state,
+						wlr_device->keyboard->led_indexes[i])) {
+					leds |= (1 << i);
+				}
 			}
+			wlr_keyboard_led_update(wlr_device->keyboard, leds);
 		}
-		wlr_keyboard_led_update(wlr_device->keyboard, leds);
+	} else {
+		xkb_keymap_unref(keymap);
 	}
 
 	int repeat_rate = 25;