[Libreoffice-bugs] [Bug 140727] New: text format toolbar highlight color selector button causes scroll

[bugzilla-daemon at bugs.documentfoundation.org]

https://bugs.documentfoundation.org/show_bug.cgi?id=140727

            Bug ID: 140727
           Summary: text format toolbar highlight color selector button
                    causes scroll
           Product: LibreOffice
           Version: 7.0.0.3 release
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: UNCONFIRMED
          Severity: minor
          Priority: medium
         Component: Writer
          Assignee: libreoffice-bugs at lists.freedesktop.org
          Reporter: skyhook at shaw.ca

If I enable the highlight colour button in the format toolbar, the mouse cursor
will scroll the viewable page, a brief jump, by crossing the toolbar/document
regions border.

I believe nothing should happen to the document without a selection in play;
the document shouldn't scroll by hover alone, only if I'm including a selection
like a mouse button down/drag while pushing the viewable area, or a type of
shift-select or discontiguous-select. 

The amount of scroll jump seems unpredictable, but I suspect it is dependent on
the time span of a critical moment. If rulers are turned off, it seems to jump
farther. The scroll jump is always upwards. I had trouble narrowing down the
minimum content required to trigger the effect, but maybe a third of a page, in
view unrelated. The cursor's original position within the document doesn't seem
related; after border crossing the scroll jumps from the current view. Effect
can be repeated; I can scroll an entire document to the top by waving the
bucket cursor back and forth over the toolbar/document border. 

To reproduce in Writer:
- create document and content to span at least one page
- scroll down enough so some content is hidden above the viewable area
- select highlight colour button in toolbar; the tool state not the pull down
- move mouse cursor document across the toolbar/document border, will scroll
view then change to bucket
- return mouse cursor to toolbar across the toolbar/document border, will
scroll view then change to pointer
- rinse and repeat until document top is reached

Workaround: 
Doesn't scroll if I avoid the toolbar/document border. Can accomplish this by
dragging the mouse cursor outside the toolbar region across the window border,
then back into the document content region across a window side border. Because
a workaround is odd but easy, I decided to label this minor. Hard to break the
habit though.

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