How to clear selection after search and isModified flag?

AndrzejB

In my method:

void CodeEditor::search(const QString &searchString) {
    if (searchString.isEmpty()) return;
    bool found = false;
    QTextCursor highlightCursor(plainEdit->document());
    QTextCursor cursor(plainEdit->document());
    cursor.beginEditBlock();
    QTextCharFormat plainFormat(highlightCursor.charFormat());
    QTextCharFormat colorFormat = plainFormat;
    colorFormat.setForeground(Qt::red);
    colorFormat.setBackground(Qt::yellow);
    while (!highlightCursor.isNull() && !highlightCursor.atEnd()) {
        highlightCursor = plainEdit->document()->find(searchString, highlightCursor, FindFlag(0));
        if (!highlightCursor.isNull()) {
            found = true;
            highlightCursor.mergeCharFormat(colorFormat);
        }
    }
    cursor.endEditBlock();
}

After cursor.endEditBlock() document is modified. How to avoid settings this flag?
If I remove cursor.beginEditBlock() and cursor.endEditBlock()
is a lot slower and isModified is set in

highlightCursor.mergeCharFormat(colorFormat);

How to highlight without modification?
If I clear modification after (is was not before) it will good?
How to remove all highlighting?

Ad1:

    bool modifiedBefore = plainEdit->document()->isModified();
............
    plainEdit->document()->setModified(modifiedBefore);

But point 2 I don't know how clear all yellow selection.
highlightCursor.clearSelection() is not enough.

AndrzejB

Solution

   cursor.select(QTextCursor::Document);
   cursor.setCharFormat(QTextCharFormat());
   cursor.clearSelection();

extracted from https://stackoverflow.com/questions/46454188/pyqt-how-can-i-reset-the-charformat-of-an-entire-qtextedit