I'm using Eclipse (several versions) on KDE 4.9.5 and have the problem that
Eclipse's tree views respond randomly to mouse click events after
some usage -- see "Steps to reproduce".

Based on
        https://bugs.eclipse.org/bugs/show_bug.cgi?id=368297

(Trees wont expand / collapse KDE single click), it appears that this is a
GTK - KDE compatibility issue, as Eclipse uses SWT (Standard Widget Toolkit)
tree views and the SWT uses GTK.

Ruslan Kabatsayev (oxygen-gtk developer) kindly provided a hint that
disabling inner shadows in Oxygen by setting the environment variable

OXYGEN_DISABLE_INNER_SHADOWS_HACK=1

may be a workaround, and this is indeed the case!
(Note that setting this variable disables gtk-compositing and gives
 somewhat uglier inner shadows but has otherwise no negative effects).

So I started the Fedora-installed eclipse by opening a bash,
	$ export OXYGEN_DISABLE_INNER_SHADOWS_HACK=1
	$ eclipse &
and -- bingo -- tree view twisties / items behaved correctly.

In parallel, I was running another Eclipse instance the usual way
(no OXYGEN_DISABLE_INNER_SHADOWS_HACK=1); here, single left-clicking on
tree-view twisties  *** continued to behave randomly ***.

To workaround the issue througout KDE, I then added a file
~/.kde/env/env.sh  with contents

export OXYGEN_DISABLE_INNER_SHADOWS_HACK=1 

Reproducible: Always

Steps to Reproduce:
1. Login on KDE

2. Run Eclipse and do some work involving tree views in Project Explorer
   and Search windows. Initially, Eclipse tree view twisties / items
   behave correctly:
   - expand   when single left-clicking on right arrow (>) => show down arrow (v)
   - collapse when single left-clicking on down arrow  (v) => show right arrow (>)

3. After working with Eclipse for some time (ranging from 15 minutes to 3 hours),
   Eclipse tree view twisties / items start reacting randomly to left clicks:
   Sometimes an item expands, sometimes not, and sometimes a click on an
   item line (which should select the item) actually closes the
   tree view section.

   When I have two instances of Eclipse (different versions ...) running,
   both instances then show the same problem.

4. The problem persists until the next logout - login cycle or the next reboot.
Actual Results:  
Eclipse tree view twisties / items start reacting randomly to left clicks:
Sometimes an item expands, sometimes not, and sometimes a click on an item line (which should select the item) actually closes the tree view section.

Expected Results:  
Eclipse tree view twisties / items should
- expand   when single left-clicking on right arrow (>) => show down arrow (v)
- collapse when single left-clicking on down arrow  (v) => show right arrow (>)


Product versions on my system:
	Fedora 17
	KDE 4.9.5
	oxygen-gtk3-1.1.2-1.fc17
	oxygen-gtk2-1.3.2.1-1.fc17
	KDE themes: Beefy Miracle or Oxygen (issue occurs with both themes)
	
	Eclipse versions:
	- Eclipse platform version:
	  4.2.1.v20120814-120134-9JF7BHVGFyMveli1uX6aTH0q-eAap6PAgOP5mO

	Eclipse used by other products:
	- Omnetpp, version: 4.2.2
	  - Eclipse platform version:
	    Version: 3.7.1.r37x_v20110729-9gF7UHOxFtniV7mI3T556iZN9AU8bEZ1lHMcVK