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Fix scrolling on the ZoomComboBox

Felix Ernst requested to merge felixernst/gwenview:fix_scrolling_on_zoomcombobox into release/21.12

Scrolling on the ZoomComboBox should go through the list of predefined zoom values of the box. Before this patch this was very unreliable. For example it didn't work as expected when the current zoom value wasn't one of the predefined values.

With this commit, scrolling should work exactly as expected.

There is one change that also affects people that aren't scrolling: The smallest zoom value is no longer generated in the list of predefined zoom values because this value is already covered by the zoom value "fit" (and by "100%" if the image is very small).

cc @broulik (who mentioned this issue in the VDG chat), @ndavis

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