set_single_paragraph_mode
Description:
Sets the single paragraph mode of this.
If setting is true, do not treat newlines and similar characters as paragraph separators;
instead, keep all text in a single paragraph, and display a glyph for paragraph separator characters. Used when you want to allow editing of
newlines on a single text line.
The default value is false.
Parameters:
| this |
a `PangoLayout` |
| setting |
new setting |