[Libreoffice-bugs] [Bug 140738] New: VIEWING: Vertical shift of text during selection after scrolling

[bugzilla-daemon at bugs.documentfoundation.org]

https://bugs.documentfoundation.org/show_bug.cgi?id=140738

            Bug ID: 140738
           Summary: VIEWING: Vertical shift of text during selection after
                    scrolling
           Product: LibreOffice
           Version: Inherited From OOo
          Hardware: All
                OS: All
            Status: UNCONFIRMED
          Severity: normal
          Priority: medium
         Component: Writer
          Assignee: libreoffice-bugs at lists.freedesktop.org
          Reporter: tuefue at rambler.ru

Created attachment 170153
  --> https://bugs.documentfoundation.org/attachment.cgi?id=170153&action=edit
Screenshot

Problem description:
If you scroll document and then start selecting text, then the selected text
moves down or up by a few pixels (see attached screenshot). In the screenshot,
the artifact is clearly visible on the letters "m" and "p" from the sides of
the selection (marked with red arrows).

Steps to reproduce:
1. Open test document (see attachment).
2. Scroll the document with the mouse wheel so that the 4th paragraph is in the
middle of the screen. It is important to scroll very fast and without pauses.
3. Start text selecting by mouse in one line somewhere in the 4th paragraph.
4. Observe shifting of the selected text.

Comments:
The bug is not always reproduced, for this reason it may be necessary to repeat
the steps described above several times. Better to reproduce in version
7.1.0.3.

This bug appears with any other scrolling methods, but the proposed steps
provides greater reproducibility.

Changing document zoom can affect the reproducibility of the bug.

It seems that the bug's reproducibility depends on the processor speed. Looks
like the bug reproduces worse on slow processors...

In some older versions, the entire document screen is refreshed after the first
mouse click on the text, this leads to “jumping” of entire lines at once.

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