Add long press left mouse speed-up

[Tulipyun]

This adds an optional mouse gesture to temporarily speed up playback while holding the left mouse button.

Changes:

• Add an option under Player > Mouse to enable long press left button speed-up.
• Add configurable speed values: 2x, 4x, 8x, 12x, 16x.
• Add configurable long press delay values: 250 ms to 500 ms.
• Default enabled, default speed 4x, default delay 300 ms.
• Restore the previous playback rate when the left mouse button is released.
• Cancel the gesture when mouse movement exceeds the system drag threshold.
• Preserve normal click, double-click, fullscreen click, and window dragging behavior.
• Fix fullscreen left-button-up forwarding to send WM_LBUTTONUP.

Tested:

• Built Release x64 successfully.
• Tested normal window and fullscreen playback.
• Tested enable/disable option.
• Tested delay values between 250 ms and 500 ms.
• Tested single click, double click, and window dragging.
• Tested Simplified Chinese and English option pages.

[v0lt]

Test build - MPC-BE.1.8.9.320_left_mouse_speed-up_1.

[tsubasanouta]

The test build works fine.
If I may ask, do you currently have plans to merge it?

[v0lt]

We will make a decision after the release.

I have doubts about the need for an adjustable delay parameter.

[Tulipyun]

I’m delighted that people are taking an interest in this feature.

As I am unable to obtain feedback on this feature from a large number of users, I am unable to determine what the optimal delay should be.

I suggest retaining the adjustable delay parameter in early versions to allow for greater flexibility whilst we await reliable user feedback.