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Send low-res scroll event in the middle of the wheel detent

José Expósito requested to merge JoseExposito/mutter:lores-scroll-mid-detent into main

Some mice send a value slightly lower than 120 for some detents. The current approach waits until a value of 120 is reached before sending a low-resolution scroll event.

For example, the MX Master 3 sends a value of 112 in some detents:

              detent                   detent
    |                        |                       |
                        ^    ^                    ^
                        112  REL_WHEEL            224

As illustrated, only one event was sent but two were expected. However, sending the low-resolution scroll event in the middle plus the existing heuristics to reset the accumulator solve this issue:

              detent                   detent
    |                        |                       |
                ^          ^             ^          ^
                REL_WHEEL  112           REL_WHEEL  224

Send low-resolution scroll events in the middle of the detent to solve this problem.

Fix #2469 (closed)

cc @carlosg @kepstin

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