QHeaderView::resizeSection is overwritten by QHeaderView::event(StyleChange)

Hi,

Since Qt 6.6.1, setting a column width on a QTableView (using horizontalHeader() resizeSection) does not work. To make the column width stick, one need to call QHeaderView::setDefaultSectionSize to set d->customDefaultSectionSize to true.

This is because in QHeaderView::event handler, when receiving QEvent.StyleChange event, the column width is reset to the default width from the style, unless a default section size has been set before.

Commit reference:

https://github.com/qt/qtbase/commit/a8df174369cecd90f14dac85bf162353b7cb25d1#diff-6fb831d1eb6f54475467c1c77a14b09a5ec51a0000ce861d8b42a9629bd81f2bL2388