[Github-comments] [geany/geany] scrollbar horizontal/vertical up/down arrow scroll adjustment (#1904)

[Colomban Wendling]

Checking the scroll values we get from the scrollbar itself on GTK3, it's ridiculous: a single (short) click on one of the steppers leads to 5 steps of `0.5` each, for a total of `0.25`.  When the minimal step configured (and thus, expected) is `1`, it gives odd results.  You basically have to click *4 times* to get a single whole step.

On GTK2 we get a reasonable value of the configured step (`1`) for each click, leading to the expected behavior.

We probably should see if there's a good way to fix this, or report it to GTK.

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