alt/meta key stopped working in 9.26

[Andreas Lutro]

Hello!

I recently updated from 9.22 to 9.26 on Manjaro (basically Arch), and all
my keybindings that uses Meta/Alt stopped working. I couldn't find anything
in the changelog that indicates changes to input handling so I'm wondering
what might've gone wrong, and where I might start investigating.

I already checked with "xev", the keys themselves are detected just fine.
The alt key also gets picked up in the terminal shell just fine - it's only
urxvt keybindings defined in Xdefaults/Xsettings that don't do anything.

I even downloaded the source package from Arch to compile 9.22 on my
current system just to make sure it's not an issue with perl or system
libraries - that works fine, and I'm putting it in my ~/.local/bin until
this gets fixed.

Some of my keybindings:

URxvt*.keysym.M-u: perl:url-select:select_next
URxvt*.keysym.M-c: perl:clipboard:copy
URxvt*.keysym.M-v: perl:clipboard:paste
URxvt*.keysym.M-equal: perl:font-size:increase
URxvt*.keysym.M-minus: perl:font-size:decrease
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