[Libreoffice-bugs] [Bug 116411] New: Navigator's Page Next randomly stops paging; Navigator' s Previous Page always pages correctly.

[bugzilla-daemon at bugs.documentfoundation.org]

https://bugs.documentfoundation.org/show_bug.cgi?id=116411

            Bug ID: 116411
           Summary: Navigator's Page Next randomly stops paging;
                    Navigator's Previous Page always pages correctly.
           Product: LibreOffice
           Version: 6.0.2.1 release
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: UNCONFIRMED
          Severity: normal
          Priority: medium
         Component: Writer
          Assignee: libreoffice-bugs at lists.freedesktop.org
          Reporter: prusselltechgroup at gmail.com

Description:
For your convenience I used LO's WG54-WriterGuideLO.odt for testing. When I
open this document and click the Navigators Page Next, it randomly stops paging
to the next page. Clicking the Page Next button advances a random number of
pages and then stops working; Subsequent clicks of Page Next appear to do
nothing.

When this occurs, clicking Previous Page and then Page Next works, until Page
Next stops working again. Previous Page always works. Page Next randomly stops
working.

Steps to Reproduce:
Test 1: Problem: Page Next - starting on Page 1

Steps:
1. Start (LO) and Open test document
2. View > Zoom > Entire Page
3. F5 to open Navigator
4. Click Next Page

Test 2: Problem:  Page Next - starting on page 300

Steps:
1. Start (LO) and Open test document
2. View > Zoom > Entire Page
3. F5 to open Navigator
4. Enter 300, Enter - The display was 1/2 page 299 and 1/2th 300 so I did a
   View > Zoom > Entire Page. This did not always occur. Some times (LO)
   positioned the document correctly on page 300.
5. Click Previous Page. (LO) goes back a page. Click Previous Page again, it
works, again, again, and again.
6. Now click Next Page. (LO) goes forward N page(s) and stops.

Actual Results:  
Test 1: Problem: Page Next - starting on Page 1

On (W), Navigator > Next Page, advanced 1 page and stopped.
The next click of Next Page did nothing.

On (L), Navigator > Next Page advanced 2 pages and stopped.
The next click of Next Page did nothing.

Test 2: Problem:  Page Next - starting on page 300

Previous Page always worked as expected.
Next Page stopped working after some random number of clicks.  I tried various
Previous Page (P) and Next Page (N). See the table below. I repeated the test
with the same (P) and got different (N). When I repeated a test I closed (LO),
restarted, and reopened the document.

NOTE: (P) always worked. Every click, moved a page. (N) did not work. I was
trying to see if there was a relationship between (P) and (N), or if clicking
(P) would make (N) work again. I didn't see a relationship, but by clicking (P)
(N) would work again for some random number. (N) stopped working after some
random number of clicks on both Windows and Linux.

(W)
P  N1 N2 N3
5  1  5  3
4  2  4  5
3  1  2  4
1  2  3  2
10 1  1  1
2  1  1  3
Page 200
0  2       - But only 1 full pages. There was 1 tiny movement.
1  1
5  5
Page 100   - The display was 1/4 page 99 and 3/4th 100 so I did a View > Zoom >
Entire Page. Some times it was correct and displayed the entire page.
0  7       - But only 5 full pages. There were 2 tiny movements.
1  2       - But only 1 full page.

(L)
P  N1 N2 N3
5  7
4  6
3  4
1  2
10 2
2  3
Page 200
0  1      - No pages, actually repositioned on the page.
1  2
5  6
Page 100
0 10      - But only 8 pages. 2 clicks were just tiny movements.
1  2

Expected Results:
When Navigator > Page Next is clicked, LO should always advance to the next
page.


Reproducible: Always


User Profile Reset: No


OpenGL enabled: Yes

Additional Info:
LibreOffice Version (LO): 6.0.2.1

Test Document: WG54-WriterGuideLO.odt
https://documentation.libreoffice.org/en/english-documentation/writer/

Environments: (L) Linux Mint 17.3 KDE 4 & Linux Mint 18.3 Mate and (W) Window 7

I checked the KDE settings and Compositing type is OpenGL 3.1.

The Navigator > Next Page problem is not limited to View > Zoom > Entire Page.
Any time the Zoom Factor was not 100% the Next Page failed at some random
number of clicks.


User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:56.0) Gecko/20100101
Firefox/56.0

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