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Added the possibility to customize the allowed maximum zoom #178
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This has been brought up by issue chxp82q#174 in the base repo
The Library "barteksc - AndroidPdfViewer" had a zoom limit of 10x (variable MAXIMUM_ZOOM in class "Pinch.java" in said Library) which did not allow to pinch over that value (methid "onScale" in class "DragPinchManager.java"). Nonethless, it was possible to double-tap-to-zoom to any value, even above 10x, causing a poor UX. For this reason, the maximum zoom has been set at 10x with a SeekBar, instead of using an EditText which allowed any value.
The seekbar has values from 0 to 9 to which 1 is added in the PDF's max zoom properties. Hence the default value 4 will produce a 5x maximum zoom.
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This has been brought up by issue #174