Window in window list does not appear randomly

Bug #1557743 reported by Luca Osvaldo Mastromatteo
6
This bug affects 1 person
Affects Status Importance Assigned to Milestone
cinnamon (Ubuntu)
New
Undecided
Unassigned

Bug Description

Ubuntu 16.04 Developement version Xenial.

Cinnamon version: 2.8.6-1ubuntu1

Basically, using steam, in random behaviours I'm unable to see in the Cinnamon window list usual steam conversation chat window with people, basically, the window in the window list applet appears once and in random behaviour it disappears. However, I'm able to see it in the ALT+TAB list. But not in the panel Window list, I have to reload steam.

In xsession-errors I got:

Window manager warning: Log level 16: STACK_OP_RAISE_ABOVE: sibling window 0x20007aa not in stack
Window manager warning: Log level 16: STACK_OP_LOWER_BELOW: sibling window 0x20007aa not in stack
Window manager warning: Log level 16: STACK_OP_RAISE_ABOVE: sibling window 0x2000e1b not in stack
Window manager warning: Log level 16: STACK_OP_LOWER_BELOW: sibling window 0x2000e1b not in stack

(cinnamon:2287): Cjs-WARNING **: JS ERROR: Error: Argument 'text' (type utf8) may not be null
WindowPreview.prototype._init@/<email address hidden>/applet.js:108
WindowPreview@/<email address hidden>/applet.js:77
AppMenuButton.prototype.onPreviewChanged@/<email address hidden>/applet.js:284
AppMenuButton.prototype._init@/<email address hidden>/applet.js:251
AppMenuButton@/<email address hidden>/applet.js:203
MyApplet.prototype._addWindow@/<email address hidden>/applet.js:1046
MyApplet.prototype._onWindowAdded@/<email address hidden>/applet.js:911

(cinnamon:2287): Cjs-WARNING **: JS ERROR: Error: Argument 'text' (type utf8) may not be null
WindowPreview.prototype._init@/<email address hidden>/applet.js:108
WindowPreview@/<email address hidden>/applet.js:77
AppMenuButton.prototype.onPreviewChanged@/<email address hidden>/applet.js:284
AppMenuButton.prototype._init@/<email address hidden>/applet.js:251
AppMenuButton@/<email address hidden>/applet.js:203
MyApplet.prototype._addWindow@/<email address hidden>/applet.js:1046
MyApplet.prototype._onWindowAdded@/<email address hidden>/applet.js:911

The window should remain visible

The window does not appear randomly, closing and reopening the window with a single person, in the Window-list cinnamon applet and is only visible in the alt + tab menu

(The window at issue is just the steam chat window with friends)

summary: - Window in window list disappeared
+ Window in window list does not appear randomly
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