No horizontal scrollbar with the PyDev Plugin in Eclipse - eclipse

I am using Eclipse Luna (4.4.0) and have recently updated the PyDev for Eclipse plugin to 3.7.
It seems since the update, my horizontal scroll bar has disappeared:
I also notice the vertical bar has changed into the "Overview Ruler Minimap" (which I like). But I really need a horizontal bar.
Does anyone know how I can get it back?

Found the solution under Preferences > PyDev > Editor > Overview Ruler Minimap.
There is an option "Show horizontal scrollbar?"

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Eclipse editor border hover - Doesn't show problem descriptions directly on hover

This is what the eclipse editor border hover is supposed to look like:
But someone messed around with our company eclipse preferences (and left the company). With our current settings the hover looks like this:
So you need to hover over the problem icon and then over again over the icon in the popup. That feels unwieldy.
Couldn't find something in the eclipse settings nor on google. Any idea how to change this setting back to the default behaviour?
Eclipse version: 2020-06 (4.16) (this problem occured in any version from Neon on where the colleague created the preferences with)
In Window > Preferences: Java > Editor > Hovers uncheck the checkbox Expand vertical ruler icons upon hovering (does not effect open editors) and close and reopen all open Java editor for that.

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How to keep scrollbars visible in Eclipse Mars and Neon on Kubuntu 16.04

After setting up a new machine with Kubuntu 16.04 and Eclipse Neon (4.6), I observed the following behavior of all scrollbars in eclipse:
vertical scrollbar is shown in a kind of thin style
when moving the mouse over the vertical scrollbar, the scrollbar became visible with standard width
when don't moving the mouse for about 1 second, the scrollbar became invisible (smooth fading out)
when moving the mouse anywhere in the e.g. editor window, the vertical scrollbar became back visible (in thin style)
Note: The horizontal scrollbar behave different as it's get only visible when touched by the mouse pointer (hover)
About the thin style scrollbar, I like this feature. But I dislike the feature that the vertical scrollbar disappears completely.
Does anybody know how to customize this?
I'd tested the following setups in all:
Kubuntu 16.04 & Eclipse Neon → scrollbar became hidden
Kubuntu 16.04 & Eclipse Mars → scrollbar became hidden
Kubuntu 16.04 & Eclipse Luna → scrollbar stays visible
Kubuntu 14.04 & Eclipse Mars → scrollbar stays visible
Kubuntu 14.04 & Eclipse Luna → scrollbar stays visible
Trying out with different themes (Window → Preferences → General → Appearance) without success regarding scrollbar visibility, even when I disable theming completely.
My current workaround is to set SWT_GTK3=0 environment variable before starting eclipse. This seems to keep all the scollbars visible but with the disadvantages that the scrollbars are also shown when not needed (e.g. less content in editor window) and also the above mentioned thin style feature is not longer available.
Edit 2018-01-17:
Tried GTK_OVERLAY_SCROLLING=0 as mentioned be #gregh works also. Shows the scrollbars in a different graphic style than SWT_GTK3=0. Now matches my system UI design better than as with SWT_GTK3=0.
This worked for me:
export GTK_OVERLAY_SCROLLING=0
Using Linux Mint 18 and eclipse 4.6, I meet the same problem.
And in Xed, Mint's default GUI text editor, it also occurs.
So this 'feature' is from OS rather than eclipse.
It can be resolved via:
Start menu --> Effects --> Overlay scroll bars (turn off) --> (re-login)
Linux Mint 18 is based on Ubuntu 16.04, so it should also work on Ubuntu.

How to enable this eclipse scroll bar?

When editing Python code I get this scroll bar (even in Java perspective):
http://pasteboard.co/22Uf7QhU.png
I have installed the PyDev plugin which gave me this bar but is it not possible to use it for Java?
I would like to see this when editing in Java rather than the standard Window's style scroll bar
but I don't know how to enable it or even what it is called.
Does anyone know?
This is the PyDev 'Overview Ruler Minimap'.
It is solely a feature of the PyDev plugin and is not available for other languages.

Error indicators in file margin in eclipse indigo

I just switched to eclipse indigo and mac osx lion. Everything works fine but errors don't show up in the right file margin like they did in past versions. The code is being built and squiglies are showing up on errors but not in the right file margin. How do I set those errors to show up?
Open Preferences, select General/Editors/Text editors/Annotations, and make sure that the errors/warnings are selected to be displayed in the Vertical and Overview rulers.
From Running Eclipse on Mac OS X Lion: 'Figured it out, if you go to system preferences > general > click the "when scrolling" button, to only show the scroll bar when scrolling it fixes it. Mine was previously on "always". I restarted eclipse and it shows the errors/warning message etc now.'