[Okular-devel] [Bug 266537] New: Rectangle selection tool may leave behind visual artifacts on pages

[Eike Hein]

https://bugs.kde.org/show_bug.cgi?id=266537

           Summary: Rectangle selection tool may leave behind visual
                    artifacts on pages
           Product: okular
           Version: 0.11.2
          Platform: Unlisted Binaries
        OS/Version: Linux
            Status: NEW
          Severity: normal
          Priority: NOR
         Component: general
        AssignedTo: okular-devel at kde.org
        ReportedBy: hein at kde.org


Created an attachment (id=57331)
 --> (http://bugs.kde.org/attachment.cgi?id=57331)
Notice the line artifact above the selection rectangle in this screenshot.

The affected Okular version reports itself as 0.11.2, but is a recent SVN
checkout of trunk.

The rectangle selection tool leaves behind visual artifacts on pages after a
particular sequence of user inputs. In the following rundown, pay special
attention to the "slowly" directive in step #3 that seems to be necessary to
reproducing the bug:

1. Ctrl+3 to enable the tool.
2. Drag a rectangle right- and upward from the initial mouse cursor position
that becomes the selection anchor.
3. Keeping left mouse firmly pressed, *slowly* move the pointer straight
downward until the height coordinate of the cursor position is below the height
coordinate of the selection anchor by a good distance, i.e. in some sense
turning the selection rectangle created in step #2 over vertically.

The result of step #3 is that a visual artifact in the shape of a line spanning
the width of the selection rectangle gets left behind just above the rectangle.
When releasing the mouse, the selection rectangle disappears, but the artifact
is left behind. It also stays in place when moving the document inside the
viewport.

The artifact can be wiped from the page by drawing a new selection rectangle
that covers it fully and then releasing the mouse.

The attached screenshot shows the artifact above the selection rectangle just
before releasing the mouse.

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