Shorten the PDFViewerApplication._parseHashParams
method
#18612
Merged
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The way that the debugging hash-parameter parsing is implemented leads to a lot of boilerplate code in this method, since most of the cases are very similar.[1]
With just a few exceptions most of the options can be handled automatically, by defining an appropriate checker for each option.
[1] With the recent introduction of TESTING-only options the size of this method increased a fair bit.