Panel anchored to screen edge moves to invisible area when connecting external monitor of larger resolution

Submitted by LAMB

Assigned to Nick Schermer

Link to original bug (#12152)

Description

Created attachment 6419 screenshots of panel placement, configuration

Setup information:

• Lenovo laptop with screen resolution of (LVDS1) = 1366x768
• Debian 8
• XFCE 4.12

My XFCE desktop has panels anchored to the top and bottom edges of the screen, with the configuration of the bottom panel as described in attachment file as panel.png.

When plugging an external monitor that has the same or lower vertical resolution (eg.: 1024x768) the placement and anchoring of the panel is respected, appearing as the red bar in attachment as arandr1.png.

When plugging an external monitor that has a higher vertical, such as 1600x1024:

** What I observe**

The viewport bound of the entire desktop extends to a vertical of height 1024, and the bottom panel becomes anchored to this edge instead of edge of screen, leaving it inside an invisible area and ubusableedge instead of the edge of the monitor view, thus being locked in an invisible region and becoming unusable, as in aranrd2.png

** What I expect**

The panel remains anchored to the edge of the screen, where it remains useful.

Attachment 6419, "screenshots of panel placement, configuration":
panebug.zip

Version: 4.12.0