The look of the MineCraft launcher on KDE is that of unstyled swing apps, resulting in the following ugly look for the launcher.
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Is this still a concern in the current Minecraft Launcher version for Linux, 1.6.84-j? If so, please update the affected versions in order to best aid Mojang ensuring bugs are still valid in the latest releases/pre-releases. If this has been done, we can reopen the issue.
Keep in mind that the "Resolved"-Status on this ticket just means "Answered", and that we are waiting for further information on whether this issue still exists or not. It will be reopened it as soon as the requested information has been delivered.
This code may fix the issue: