QTextTable Issue

[Saugglocke]

Hey,

I'm trying to align text in the middle (vertical) of a QTextTableCell. The thing is it is working with the second cell, but not with the first one. The cause is the method setBlockFormat() or the used block format. What am I missing or is it a bug?

Thanks in advance and best regards!
Qt Version: 5.3.2

Here's a minimal example:
@#include "mainwindow.hpp"
#include <QTextEdit>
#include <QTextCursor>
#include <QTextTableFormat>
#include <QTextTableCell>

MainWindow::MainWindow(QWidget *parent)
: QMainWindow(parent)
{
QTextEdit *te = new QTextEdit(this);
QTextCursor tc = te->textCursor();
QTextTable *tt = tc.insertTable(2, 2);

// cell width
QTextTableFormat ttf = tt->format();
QVector<QTextLength> cWC;
cWC.append(QTextLength(QTextLength::PercentageLength, 70.0));
cWC.append(QTextLength(QTextLength::PercentageLength, 30.0));
ttf.setColumnWidthConstraints(cWC);
tt->setFormat(ttf);

QTextTableCell ttc = tt->cellAt(0, 0);
// set cell height and block format alignment <- causing the offset
QTextBlockFormat tbf = ttc.firstCursorPosition().blockFormat();
tbf.setLineHeight(50.4f, QTextBlockFormat::FixedHeight);
tbf.setAlignment(Qt::AlignLeft | Qt::AlignVCenter);

// set vertical alignment
QTextCharFormat tcf = ttc.firstCursorPosition().charFormat();
tcf.setVerticalAlignment(QTextCharFormat::AlignMiddle);

// set format for first column
QTextCursor tc1 = tt->cellAt(0, 0).firstCursorPosition();
tc1.setPosition(tt->cellAt(1, 0).firstPosition(), QTextCursor::KeepAnchor);

tc1.setBlockCharFormat(tcf);
tc1.setBlockFormat(tbf); // here is the cause, but whats wrong here?
tc1.insertText("TEST"); // false alignment! seems to be one line off

// set format for second column
tc1 = tt->cellAt(0, 1).firstCursorPosition();
tc1.setPosition(tt->cellAt(1, 1).firstPosition(), QTextCursor::KeepAnchor);
tc1.setBlockCharFormat(tcf);
tc1.insertText("TEST"); // correct

setCentralWidget(te);

}

MainWindow::~MainWindow()
{

}@