Menu on github's website to switch branches is partly missing

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Qupzilla version: v1.8.6 portable, official binary
OS: Windows 10 x64

Steps to reproduce:

1. Visit https://github.com/QupZilla/qupzilla
2. Press the button above the list. At present, the caption reads "Branch: v1.8"
3. The menu shows up and does not function properly. See the screenshot

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Some additional information.
Webkit version: 537.21
Qt version: 4.8.5

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You can se here and here including references as well.

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Thanks for the references.
From what I read, it is a upstream Qt bug that had been fixed.

So, in this case, I would like to ask, is there a possibility that the build on the official website be updated?
The official win32 build portable edition is still using Qt 4.8.5, which is the problematic one that I'm using.

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Yes, I'll try to build next version (1.8.7) with latest Qt 5.5 on Windows.