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All the below calls to resize() use subtraction in the size calculation and might underflow because of the size being an unsigned int.

To each, add a check to make sure that subtraction doesn't result in a negative value.

abouttab.cc:            text_edit.resize(width() - 2*margin, height() - 2*margin);
abouttab.cc:            text_edit.resize(width - 2*margin, height - 2*margin);
combobox.cc:            listbox.resize(width() - 10, 100);
filebrowser.cc: lineedit.resize(width - 60 - brd, btn_h);
filebrowser.cc: listbox.resize(width - 1 - 2*brd, height - btn_h - 2*brd - offset);
filebrowser.cc: btn_esc.resize((width - 1 - 2*brd) / 2 - brd / 2, btn_h);
filebrowser.cc: btn_sel.resize((width - 1 - 2*brd) / 2, btn_h);
frame.cc:               content->resize(content_width, content_height);
layout.cc:                              item->resize(w, item_height);
layout.cc:                              item->resize(w, 0);
layout.cc:                              item->resize(item_width, h);
layout.cc:                              item->resize(0, h);
listbox.cc:     basic.resize(width - (7 + 7),
listboxthin.cc: basic.resize(width - (1 + 1),
mainwindow.cc:  tabs.resize(width - 2 * 16, height);
stackedwidget.cc:               currentWidget->resize(width(), height());
stackedwidget.cc:               currentWidget->resize(width, height);
tabwidget.cc:           stack.resize(width, height - bar_height);
textedit.cc:            scroll.resize(scroll.width(), height - 2*(y_border - 1));
window.cc:      native->resize(width, height);