Clicking the dock raised a native file browser, which was the right answer
while the editor had exactly one thing to offer an empty tab. It is the
wrong answer now: a file browser can only ask which PDF, and the answer is
sometimes none of them.
So the dock opens the editor, and the empty editor says what it can do.
The drop zone stays, and learns to read what it is given — pictures become
pages, several PDFs become one document. Beside it sit the three ways in
as buttons.
Not included: compress, which cannot be done honestly without re-encoding
the images, and split, which is the page rail plus Save a copy.
A document built from pictures or joins has never been on disk, so it is
marked unsaved from the moment it opens — otherwise closing the tab would
bin it without asking. An empty editor also stops claiming to hold a file
called document.pdf.
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