### Godot version

v4.0.beta.custom_build [13f0158]

### System information

Windows 10

### Issue description

When doing operations (`begin_complex_operation` and `end_complex_operation`) with multiple selections in TextEdit, some of these selections don't revert upon undo. This behavior is affects some of script editor's operations, like duplicate selection and delete lines.

### Steps to reproduce

Open script editor, make multiple selections. Keep in mind what you have selected. Do duplicate selection (ctrl+shift+D). Undo (ctrl+Z). Compare the result to what you remember.

### Minimal reproduction project

N/A
if (cc == '\\') {
												bool escaped = true;
												while (j + 1 < text[i].length() && text[i][j + 1] == '\\') {
													escaped = !escaped;
													j++;
												}
												if (escaped) {
													j++;
													continue;
												}
											}
										} while (cc != quotation);
									} else if (cc == c) {
										stack++;
									} else if (cc == closec) {
										stack--;
									}
									if (stack == 0) {
										brace_matching.write[caret].open_match_line = i;
										brace_matching.write[caret].open_match_column = j;
										brace_matching.write[caret].open_matching = true;
										break;
									}
								}
								if (brace_matching.write[caret].open_match_line != -1) {
									break;
								}
							}
							if (!brace_matching.write[caret].open_matching) {