howl.ui.TextWidget
opts.tab_size sets the width of a tab, in spaces
assert.equals 2, TextWidget(tab_size: 2).view.config.view_tab_size(resource management)
widgets are collected as they should
w = TextWidget!
list = setmetatable {w}, __mode: 'v'
w = nil
collectgarbage!
assert.is_true list[1] == nil