### Godot version

v4.0.beta10.official [d0398f62f]

### System information

Windows 22H2, Compatibility, GeForce GTX 550 Ti

### Issue description

Multiple lines of error messages are copied without line breaks:
The script editor's error panel shows:
```
Line 6:Expected parameter name.
Line 6:Expected closing ")" after function parameters.
Line 6:Expected ":" after function declaration.
```
But selecting and copying them `ctrl c`, copies them without line breaks:
```
Line 6:Expected parameter name.Line 6:Expected closing ")" after function parameters.Line 6:Expected ":" after function declaration.
```


### Steps to reproduce

- start Godot
- open the attached project
- open the script `Node2D.gd`
The status bar shows an error message.
- click on the red circle with an x in it, and the number 3 to the right of the circle.
The script editor's error panel shows three messages:
>Line 6:Expected parameter name.
Line 6:Expected closing ")" after function parameters.
Line 6:Expected ":" after function declaration.

- select all three lines, and copy them `ctrl c`
- in the script editor, click on the empty line 12 to place the cursor there.
- paste `ctrl v`

### Expected
The copied lines should be pasted on three lines, as they appeared in the error panel.

### Observed
There are no line breaks, they appear on the same line:
```
Line 6:Expected parameter name.Line 6:Expected closing ")" after function parameters.Line 6:Expected ":" after function declaration.
```


### Minimal reproduction project

[issue, error messages copied without line breaks.zip](https://github.com/godotengine/godot/files/10361376/issue.error.messages.copied.without.line.breaks.zip)

String word_at_pos = tx->get_word_at_pos(local_pos);
		if (word_at_pos.is_empty()) {
			word_at_pos = tx->get_word_under_caret(caret_clicked);
		}
		if (word_at_pos.is_empty()) {
			word_at_pos = tx->get_selected_text(caret_clicked);
		}
		bool has_color = (word_at_pos == "Color");
		bool foldable = tx->can_fold_line(row) || tx->is_line_folded(row);
		bool open_docs = false;
		bool goto_definition = false;
		if (word_at_pos.is_resource_file()) {
			open_docs = true;
		} else {
			Node *base = get_tree()->get_edited_scene_root();
			if (base) {
				base = _find_node_for_script(base, base, script);
			}
			ScriptLanguage::LookupResult result;
			if (script->get_language()->lookup_code(tx->get_text_for_symbol_lookup(), word_at_pos, script->get_path(), base, result) == OK) {
				open_docs = true;
			}
		}
		if (has_color) {
			String line = tx->get_line(row);
			color_position.x = row;
			color_position.y = col;
			int begin = -1;
			int end = -1;
			enum EXPRESSION_PATTERNS {