macOS: do not pass input events while having marked text

fix chinese input method backspacing issue

macOS: Set pre-edit text for IME

macOS: implement glfwPlatformUpdateIMEState

set firstRectForCharacterRange correctly

macOS: update IME position on each input

macOS: use float instead of int for updateIMEState

minor fix

macOS: ignore marked text on deadkey

fixes german keyboard input

macOS: convert markedRect to screen coord

kitty/keys.c

@@ -143,6 +143,11 @@ on_key_input(int key, int scancode, int action, int mods, const char* text, int
             } else debug("committed pre-edit text: (null)\n");
             return;
         case 0:
+            // for macOS, update ime position on every key input
+            // because the position is required before next input
+#if defined(__APPLE__)
+            update_ime_position(global_state.callback_os_window, w, screen);
+#endif
             break;
         default:
             debug("invalid state, ignoring\n");