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Opera Developer Crashing when merging two windows

  • Hello,

    First of all, sorry for the title. I was trying to find better words, but I'll do my best to explain it here.

    I have the habit of splitting my browser windows so I can read and keep doing my staff on the left window while listening to music and seeing videos on the window in the right.

    The problem is that when I try to join the window (or tab) on the right with the one on the left, the entire browser closes on me.

    Both images trying to demonstrate what I do are here: https://imgur.com/a/05BYBfH
    Once I release the YouTube tab, the entire browser closes.

    I already tried to disable ad-blocker, reset all flags to default and do a clean installation. I do not use any extensions.
    I also tested Opera Stable and it does not seem to have this issue, but it has another (already reported and super annoying) that won't place the cursor on address bar when opening a new tab. That's why I keep using the Developer version.

    Currently, I'm running Linux Mint 19 and Opera Developer 57.0.3072.0. Those are my laptop configs and system info: http://termbin.com/y8pm

    I'm reporting with YouTube, but it actually happens with any website. I'm also running with those flags on the Opera shortcut (but I tried without them and the crash still happens):
    --enable-native-gpu-memory-buffers --disk-cache-dir=/tmp/operacache --start-maximized

    I hope the infos are enough (but I can happily provide more in case devs need). Thank you!