[PyQt] QGridLayout, QProgressBar bar fills widgets shrink

[malonn]

I have a QGridLayout with some QLabels and QLineEdits and a QProgressBar. As the progress bar fills, the QLineEdits shrink. What's up with that. Code:

wnd_grid, wnd_edit = QGridLayout(), QTextEdit()
prog = QProgressBar
header = ['To:', 'CC:', 'BCC:', 'Subject:']
edits = [QLineEdit(), QLineEdit(), QLineEdit(), QLineEdit()]
for i, (lab, lin) in enumerate(zip(header, edits)):
    wnd_grid.addWidget(W.QLabel(lab), i, 0)
    wnd_grid.addWidget(lin, i, 1, 1, 5)
wnd_grid.addWidget(wnd_edit, 4, 0, 1, 6)
wnd_grid.addWidget(prog, 5, 1)

Standard stuff. I just don't know why growing progress shrinks a column space? These widgets are set in a QMainWindow with a frame as the central widget, then the GridLayout's parent is the frame. Obviously, the QMainWindow has a layout by default, so I can't add a second. It has a central widget, but can I set another widget (like a frame), and then set another layout to house the progressbar. I'm just thinking separating the PB from the layout with Line Edits. Is there something else I can do?

---

Well, I posted prior to any real attempt to solve this problem on my own. I fixed it with a different approach. By using a VBoxLayout as my main layout, and then nesting HBoxLayout's with the necessary widgets, the problem is gone.

If anyone has any idea about the grid issue, I'd like to hear a solution or potential solution.