### Godot version

v4.0.beta15.official [4fa6edc88]

### System information

Windows 10

### Issue description

I use a custom keyboard layout (I made it myself), and it has «dead keys» (just like International keyboard layouts have). For example, if I press `'`, nothing happens, but if I press `a` after that, I'll get `á`. If I press `'` and `Space`, I'll get just `'`. And with my layout:
If I press `Shift + .` and then `a`, I will get `ᵄ`.
If I press `Shift + .` and then `Space`, I will get `>`.
If I press `Shift + [` and then `5`, I will get `₅`.
If I press `Shift + [` and then `Space`, I will get `{`.
In beta 14 and before, everything worked fine, but in beta 15 when I press `Shift + .` and `Space`, just nothing happens, I don't get `>`. Same for `Shift + [` and `Space`, I don't get `>`. It seems the problem is with `Shift`, because I still can type `á` (`'` and `a`) or `'` (`'` and `Space`), but not `ä` (`Shift + '` and `a`) or `"` (`Shift + '` and `Space`). In the latter cases I get `á` and `'` as if `Shift` were never pressed.

### Steps to reproduce

Install/add US International keyboard layout or [Extended Latin keyboard layout](https://github.com/godotengine/godot/files/10494466/Layouts.zip) (just run `Extended Latin\ExtLat6\setup.exe`).
Open script editor.
Press `Shift + '`.
Then press `a`.

### Minimal reproduction project

N/A
if (!windows[window_id].window_has_focus && mouse_mode == MOUSE_MODE_CAPTURED) {
						break;
					}
					Ref<InputEventMouseMotion> mm;
					mm.instantiate();
					mm->set_window_id(window_id);
					mm->set_ctrl_pressed(GetKeyState(VK_CONTROL) < 0);
					mm->set_shift_pressed(GetKeyState(VK_SHIFT) < 0);
					mm->set_alt_pressed(alt_mem);
					mm->set_pressure(windows[window_id].last_pressure);
					mm->set_tilt(windows[window_id].last_tilt);
					mm->set_pen_inverted(windows[window_id].last_pen_inverted);
					mm->set_button_mask(last_button_state);
					mm->set_position(Vector2(coords.x, coords.y));
					mm->set_global_position(Vector2(coords.x, coords.y));
					if (mouse_mode == MOUSE_MODE_CAPTURED) {
						Point2i c(windows[window_id].width / 2, windows[window_id].height / 2);
						old_x = c.x;
						old_y = c.y;
						if (mm->get_position() == c) {
							center = c;
							return 0;
						}
						Point2i ncenter = mm->get_position();
						center = ncenter;
						POINT pos = { (int)c.x, (int)c.y };
						ClientToScreen(windows[window_id].hWnd, &pos);
						SetCursorPos(pos.x, pos.y);
					}