QTextLayout.lineCount() returns 0 in certain situations

// After contentsChange(int, int, int) was triggered.

auto lineCount = blockLayout->lineCount();
for (int i = 0; i < lineCount; ++i) {
    // We'll never get here, if any word in the block is highlighted. :-(
    
    auto line = blockLayout->lineAt(i);
    if (line.isValid()) {
    
        // Hyphenation or any other line operation.
    
    }
}