Dialog boxes positioned off-screen (hence unusable) on multi-monitor setup with different vertical resolutions

[Jack Kelly]

SETUP

* Ubuntu 17.04 using Unity 7.
* Multi-monitor setup, where the vertical resolutions of the
  monitors are different.
* compiz version 1:0.9.13.1+17.04.20170109-0ubuntu1

PROBLEM

Dialog boxes are positioned in the "invisible space" above the smaller monitor. Hence the dialog boxes are unusable.

FURTHER INFORMATION

In my case, my left monitor (the monitor built into my laptop) is 1600x900 and my right monitor is 1920x1200. Their bottom edges are aligned. Ubuntu places dialogs in the "invisible space" above my laptop screen. Here's a diagram of the situation:

      -- 3 -- |###############|
      ------- |###############|
     |#######||###### 2 ######|
     |## 1 ##||###############|
     |#######||###############|

Key: 1 = my 1600x900 laptop monitor
     2 = my 1920x1200 external monitor
     3 = "invisible space" where Ubuntu positions dialog boxes

I don't remember this happening in 16.10 or before. This problem started when I upgraded to 17.04.

This problem is not fixed by setting the launcher to display on the larger monitor.

WORK AROUNDS

* Use Gnome 3 instead of Unity 7 (with a multi-monitor setup).
* Use Unity 7 with a single monitor.

---------------

[Test Case]

1. Use Ubuntu 17.04 with Unity 7.
2. Use at least two monitors with different vertical resolutions.
3. Trigger a dialog box (e.g. start a browser and hit CTRL-S to open a save window)

[dino99 (9d9)]

That version is now dead
http://news.softpedia.com/news/ubuntu-17-04-zesty-zapus-has-reached-end-of-life-upgrade-to-ubuntu-17-10-now-519360.shtml