Insert a blank page after specified page number(s)

[raindropsfromsky]

Allow the user to insert blank pages at specified page-number(s) of the book.

Here are some use cases:

Often an author makes a pdf that is best suited for viewing in "Reader" mode, where specific pages are displayed in Left-Right pairs (facing each other). For example,

• A diagram on the left page and its explanation on the right page.
• A whole diagram that is spread on two facing pages.

To achieve this effect, the author has to insert blank pages at certain places in the file, so that the pdf reader shows the correct L-R pairs.

But in some pdf files, such blank pages are missing. (For example, the author has forgotten to start each new chapter on the right, by inserting a blank page.)

pdfSam should have a feature to insert blank pages at specified page number(s).

Notes:

1. The size of the inserted blank page size should match the existing pages of the pdf.
2. If the user wants to insert blank pages after multiple page-numbers, they refer to the current page numbers of the book. (when we insert a blank page, the subsequent page numbers get incremented by one. We are not referring to such incremented page numbers.)