Formatting: alphabetical settings
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Fixed: double-tap on highest zoom level and then pinch-out causing jump

Previously, double-tapping on the highest zoom level and then pinch-zooming out was causing an unexpected jump to the first page (0,0). Now we only call handleDocumentDoubleClick upon double-tap if the current zoom level is less than the maximum.
Fixed: double-tap not working in grid mode

Previously, double-tap to zoom in was only implemented in document view. Now, if in grid view, double-tapping jumps to the tapped page (calls existing handleGridDoubleClick method).