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I use IceWeasel on Debian Stretch, with LXDE.
While most application icons display just fine (including IceDove), the IceWeasel icon exhibits a problem. Very often (but not always!) the large icon is not scaled to fit the taskbar, and I only see its top-left corner. I can't quite make out what the exact conditions for this are. How do I fix this? And is it a bug, a misconfiguration or an issue with the icon somehow?
Here's a screenshot of the Alt-Tab menu:
and here's the icon of which I'm only getting the corner: