### Godot version

4.0 beta 15

### System information

Windows 10

### Issue description

It happened with both Google IME and MS-IME, and there was no problem until Beta14.
When typing Japanese characters, it is common to select a character from the suggestion window and then start typing the next character before confirming.
In this case, uncommitted characters are forcibly committed, and input of the next character begins.

**↓Beta15**

https://user-images.githubusercontent.com/186786/214753450-b493cca6-2644-4b3d-8cd2-660565cc3547.mp4

**↓Beta14**

https://user-images.githubusercontent.com/186786/214755127-dde819cc-4d63-403a-99b0-09821671f74e.mp4



### Steps to reproduce

It happened with both Google IME and MS-IME in beta15

### Minimal reproduction project

It is project independent and happens in the editor.
selection.enabled = true;
						selection.begin = 0;
						selection.end = text.length();
						selection.double_click = true;
						last_dblclk = 0;
						set_caret_column(selection.begin);
						if (!pass && DisplayServer::get_singleton()->has_feature(DisplayServer::FEATURE_CLIPBOARD_PRIMARY)) {
							DisplayServer::get_singleton()->clipboard_set_primary(text);
						}
					} else if (b->is_double_click()) {
						
						last_dblclk = OS::get_singleton()->get_ticks_msec();
						last_dblclk_pos = b->get_position();
						PackedInt32Array words = TS->shaped_text_get_word_breaks(text_rid);
						for (int i = 0; i < words.size(); i = i + 2) {
							if ((words[i] < caret_column && words[i + 1] > caret_column) || (i == words.size() - 2 && caret_column == words[i + 1])) {
								selection.enabled = true;
								selection.begin = words[i];
								selection.end = words[i + 1];
								selection.double_click = true;
								set_caret_column(selection.end);
								break;
							}
						}
						if (!pass && DisplayServer::get_singleton()->has_feature(DisplayServer::FEATURE_CLIPBOARD_PRIMARY)) {
							DisplayServer::get_singleton()->clipboard_set_primary(text.substr(selection.begin, selection.end - selection.begin));
						}
					}
				}
				selection.drag_attempt = false;