DocViewer - Update desktop gui after ux research

[tusmester]

• [x] Customize header
• [x] Thumbnails should be switchable
• [x] Customize title - embed pager after doc.title
• [x] Comments should be switchable
• [x] Comment button position should be fixed

[kultsar]

unfinished yet...

Thumbnails should be switchable

• [x] Swithing thumbnails on or off should not make the preview page jump left-right (Csabi also mentioned this).

Customize title - embed pager after doc.title

• [x] When I keep clicking the up or down arrow buttons to increase-decrease the page number one after the other, it usually works for 2-6 pages or so, but then often it just stops changing the numbers. When it stops, the actual page number is selected (when text is selected for copy/cut operation). When I move the mouse pointer just a bit, text selection remains, but it works again (next number is not selected). Can reproduce frequently, but only with the mouse. Keyboard up-down buttons have no problem. Laptop touchpad seems to reproduce more frequently, laptop external mouse a bit less frequently. Should test on desktop computer.
• [x] Pager default number should be the active page number of the actively opened document. Now it seems to remember the last used number, globally. If I used it on page 6, it will be page 6 in another document, even if it has only 1 page.

page range validation. Do we need it? --> moved to #25

• [ ] [UX?] User should be able to delete all digits and begin entering new ones. Presently cannot manually set a number below 10 (except for the digit that I cannot delete).
• [ ] [UX?] When I manually edit the numbers, jumping to the page should be suspended until I press enter. At first this feature seemed cool, but I might change my mind, and escape the field and might want to remain on my previous page, so now I feel this feature might be annoying.

Zoom

• [x] Zooming out: Starting with a zoom ratio when the full page cannot be seen, each click gradually scales the image down well. When the full image is seen ("fit full page"), however, the next click results in the same image size. Another and subsequent clicks: the image disappears. The same number of clicks on zoom in brings the image back, but when it first appears, it is much larger than seen for the last time. Another click on zoom in scales down the image to fit full page Subsequent zoom in clicks are ok.
• [x] When zooming out a page rotated to right or left (but not upside down), the same problem can be observed, but when the first problem occurs (next click does not reduce image size), image contents are pushed down. Next click makes image disappear.

Other

• [x] Sometimes previously already generated page and thumbnail images somehow disappear and are not generated any more until I reopen the preview for the content, I just see a placeholder image. Could not yet find a way to always reproduce.