IDLE: touchpad horizontal scrolling not working

Bug report

Bug description:

I know that there isn't a horizontal scrollbar for a reason but I believe that horizontally scrolling on a touchpad/trackpad should still scroll the IDLE editor horizontally. Right now trying to horizontally scroll a file, scrolls it vertically which I find very counter intuitive. The reason for this behaviour is in Lib/idlelib/tree.py (which is used in Lib/idlelib/editor.py):

def wheel_event(event, widget=None):
    ...
    up = {EventType.MouseWheel: event.delta > 0,
          EventType.ButtonPress: event.num == 4}
    lines = -5 if up[event.type] else 5
    widget = event.widget if widget is None else widget
    widget.yview(SCROLL, lines, 'units')
    return 'break'

The function doesn't respect the direction of scrolling and instead just scrolls vertically (yview). I know this is a minor bug but it's annoying me so much when IDLE tries to scroll vertically when I am scrolling horizontally

CPython versions tested on:

CPython main branch

Operating systems tested on:

Linux, Windows

Linked PRs

• gh-140390

Lib/idlelib/tree.py の wheel_event() から始め、次に Lib/idlelib/editor.py でどのように使用されているかを確認します。サポートされているイベント型でタッチパッドの方向がどのように表現されるかを確認します。完了条件は、Linux と Windows でタッチパッドの水平スクロールによって IDLE エディターが垂直ではなく水平方向に移動することです。