cannot drag window to lower monitor via title bar

[Aaron Bentley]

With a multi-monitor set up, windows cannot be dragged all the way from the upper (primary) monitor to the lower (secondary) monitor using the title bar. They can be dragged part-way, but the title bar cannot be dragged below the Unity title bar.

However, windows can be dragged from the upper monitor to the lower monitor using ALT+mouse

[Bilal Akhtar (bilalakhtar)]

Could you kindly elaborate by providing steps on how to reproduce this bug? Since I am not able to reproduce this. I can drag a window from a taller (resolution) monitor to a shorter one in one go properly.

[Aaron Bentley (abentley)]

I don't think the problem has anything to do with the size of the monitors. It's a problem dragging from an upper monitor to a lower one. That is, dragging a window down, past the bottom of the upper monitor and the top of the lower monitor.

The problem only shows when dragging the window by its title bar, and does not show when dragging the window up from the bottom monitor.

[Aaron Bentley (abentley)]

When dragging down, the bottom of the title bar won't move past the bottom of the top monitor.

[Aaron Bentley (abentley)]

Hmm, now I'm noticing an additional condition: the problem seems to only happen if some part of the window would be off-screen on the right side of the lower monitor. If I move the window to the left, it "unsnaps" when none of it is off-screen to the right.

Perhaps it's relevant that the lower monitor is smaller, and positioned so that its left-hand side is aligned with the left-hand side of the upper monitor. So the lower-right corner is part of the virtual screen, but not assigned to a monitor. I notice some analogous behaviour dragging the window to the right. It seems like the title bar is refusing to be dragged into unviewable portions of the virtual screen.

It would be a lot less confusing if this behaviour applied to the entire window, not just the title bar. However, as I noted earlier, this behaviour can be defeated by alt+dragging.

[Omer Akram (om26er)]

Thanks for the bug report. This particular bug has already been reported and is a duplicate of bug 767574, so is being marked as such. Any further discussion regarding the bug should occur in the other report. Feel free to report any other bugs you may find.