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TIP 684 [1] introduced TouchpadScroll events in Tcl/Tk 8.7, separating trackpad gestures from traditional MouseWheel events. This broke trackpad scrolling in gitk where trackpads generate TouchpadScroll events instead of MouseWheel events. Fix that by adding TouchpadScroll event bindings for all scrollable widgets following the TIP 684 specification. Implement a new precisescrollval proc to handle the smaller delta values from TouchpadScroll events, using appropriate scaling factors that seem sensible on my MacBook. Fixes https://github.com/j6t/gitk/issues/31. [1]: https://core.tcl-lang.org/tips/doc/main/tip/684.md Signed-off-by: Ruoyu Zhong <zhongruoyu@outlook.com>