Public bug reported:

This is a general bug in GTK3 overlay scrolling (the new kind, not the
old "overlay scrollbars" feature).

When a window needs both horizontal and vertical scrolling the actual
accessible content is reduced by the size of the scrollbars that show up
when you move the mouse into the window.  Normally the scrollbars are
logically outside the scrollable area and that whole are can be scrolled
into view. With overlay scrolling this is not the case because the
scrollbars OVERLAY the scrollable content, effectively making part of
that content unreachable.

In case of a text-file opened in GEDIT this means that the last text-
line will be covered by the horizontal scrollbar and you can not scroll
further down to scroll it above the horizontal scroll bar (see the
attached screenshot).

The fix would obviously be to extend the logical scroll range of both
scrollbars with the width of the other scrollbar if that exists.

ProblemType: Bug
DistroRelease: Ubuntu 15.10
Package: gedit 3.10.4-0ubuntu13
ProcVersionSignature: Ubuntu 4.2.0-18.22-generic 4.2.3
Uname: Linux 4.2.0-18-generic x86_64
ApportVersion: 2.19.1-0ubuntu4
Architecture: amd64
CurrentDesktop: Unity
Date: Mon Nov 16 17:59:46 2015
ExecutablePath: /usr/bin/gedit
InstallationDate: Installed on 2015-11-04 (12 days ago)
InstallationMedia: Ubuntu 15.10 "Wily Werewolf" - Release amd64 (20151021)
SourcePackage: gedit
UpgradeStatus: No upgrade log present (probably fresh install)

** Affects: gedit (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug wily

** Attachment added: "Screenshot of GEDIT with partly covered last line of text"
   
https://bugs.launchpad.net/bugs/1516713/+attachment/4520212/+files/Screenshot%20from%202015-11-16%2017-56-03.png

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https://bugs.launchpad.net/bugs/1516713

Title:
  gtk3 overlay scrollbars consitently show wrong behaviour

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