Method prepend

src/Gui/TextEdit.cpp:529–552

PythonTextEditor::~PythonTextEditor() = default;

void PythonTextEditor::prepend(const QString& str)
{
    QTextCursor cursor = textCursor();
    // for each selected block insert a tab or spaces
    int selStart = cursor.selectionStart();
    int selEnd = cursor.selectionEnd();
    QTextBlock block;
    cursor.beginEditBlock();
    for (block = document()->begin(); block.isValid(); block = block.next()) {
        int pos = block.position();
        int off = block.length() - 1;
        // at least one char of the block is part of the selection
        if (pos >= selStart || pos + off >= selStart) {
            if (pos + 1 > selEnd) {
                break;  // end of selection reached
            }
            cursor.setPosition(block.position());
            cursor.insertText(str);
            selEnd += str.length();
        }
    }

    cursor.endEditBlock();
}

void PythonTextEditor::remove(const QString& str)
{