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How to set background color for line (not text) in QTextEditor.
Example, every line start with text "DEPRECATED" will set background color red.
use QTextCharFormat only fill background for text

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QTextEdit::ExtraSelection h;
h.cursor = textCursor();
h.format.setProperty(QTextFormat::FullWidthSelecti on, true);
h.format.setBackground(Qt::green);
QList<QTextEdit::ExtraSelection> extras;
extras << h;
setExtraSelections(extras);