https://bugs.documentfoundation.org/show_bug.cgi?id=160496
Bug ID: 160496
Summary: Viewport jumps after moving cursor to different style
Product: LibreOffice
Version: 7.6.5.2 release
Hardware: x86-64 (AMD64)
OS: Linux (All)
Status: UNCONFIRMED
Severity: normal
Priority: medium
Component: Writer
Assignee: libreoffice-bugs@lists.freedesktop.org
Reporter: t...@faehnle.net
Created attachment 193451
--> https://bugs.documentfoundation.org/attachment.cgi?id=193451&action=edit
Demo document to trigger "jumping viewport"
Version: 7.6.5.2 (X86_64) / LibreOffice Community
Build ID: 38d5f62f85355c192ef5f1dd47c5c0c0c6d6598b
CPU threads: 16; OS: Linux 5.10; UI render: default; VCL: kf5 (cairo+xcb)
Locale: de-DE (de_DE.UTF-8); UI: en-US
Calc: threaded
Hi there,
this is a funny one: Cursor movement to a different paragraph or character
style seems to trigger a viewport alignment to the closest page break iff the
zoom level is set to "entire page".
To reproduce:
* Load attached document
* Set View->Zoom->Entire page
* Put the cursor on the line that reads "put cursor here"
* Scroll down half a page using the mouse wheel. The gap between first and
second document page should be in the middle of the screen.
* Move the cursor up and down a few lines, using the arrow keys. Do it slowly,
say one keystroke per sec. DON'T leave the visible region with the cursor
Observation:
When you reach the first "preformatted text" paragraph, the viewport scrolls up
so that page 1 is visible in full. This happens with a few tenths of a second
delay.
Expectation:
The viewport should stay where it is. As long as the cursor stays within the
visible region, there's no reason for unsolicited viewport movement.
According to my observations, the exact styles involved don't matter. It also
doesn't seem to matter, how the cursor movement is accomplished: I can trigger
this with arrow keys, by mouse clicking, or as a side effect of advancing by
pages -- I discovered this bug while experimenting with the different next
page/previous page UNO functions.
Needless to say that this bug will drive you crazy if you're editing in the
vicinity of a page break and happen to touch different para/char styles with
the cursor.
Cheers,
Tyler
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