QTabWidget - tab icons not in the center - qt

Question

I have a QTabWidget with six tabs, and all the tabs have an icon -
but the icons are not in the center of the tab:
What I've done so far :
tabWidget->setStyleSheet("QTabBar::tab {width: 40px; height: 40px;}"
"QTabBar::tab:selected {background: lightblue;}");
tabWidget->setIconSize(QSize(40, 40));
tabWidget->addTab("widget", QIcon("iconPath"), ""); //<--for all six tabs
And:
tabWidget->setTabIcon(index, QIcon("iconPath"));
Any ideas why this is happening, and how I can fix it?

Answer 1

I too have been struggling with this issue. Here is how I resolve it.
Background:
I was attempting to get a left side tab menu going, which used icons as its indicators (what the users would see), however I had a problem:
My icons, which were set using the currentTabIcon in the Property Editor, were aligning to the bottom (which is expected since I am using the West orientation. Normally, the North orientation would be selected and the icons would be on the left).
I had this as my stylesheet:
QTabBar::tab:hover {
background-color: #212121;
}
QTabBar::tab:selected{
background-color: #313131;
}
QTabBar::tab {
background-color: #111111;
height:70px;
width: 70px;
border: none;
}
Now, attempting the suggested solution found in this post whereby I set the margins did not have the desired effect, infact it had no effect at all.
Solution:
After playing around with some of the CSS properties, I discovered that setting the padding-top and padding-bottom gave me the desired result.
adding the lines:
padding-top: -15px;
padding-bottom: 15px
Resolved the problem for me, however this needs to be changed according to your needs.
My final stylesheet resembles:
QTabBar::tab:hover {
background-color: #212121;
}
QTabBar::tab:selected{
background-color: #313131;
}
QTabBar::tab {
background-color: #111111;
height:70px;
width: 70px;
border: none;
margin: 0px;
padding-top: -15px;
padding-bottom: 15px
}

Answer 2

If somebody has the same problem like me with the icons in the tabs, I found a solution after days and days search for this, and its so simple :D
Just add this to the stylesheet for the TabWidget:
tabWidget->setStyleSheet("::tab {margin: 0px;}");
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