Hi guys, this occurred after I modify Ubuntu’s Royal Theme, through Unity Tweak Tool and editing some lines in its source codes . . . .
But I don’t remember doing anything with the preference of Atom. When I reverted back to the state of the theme where Atom did not have this bug, it still occurred.
PS. Also the tabs in this dark-flat-ui theme (@olmokramer’s theme) is auto stretched and auto-sized in length whenever I create a new tab, but in this bug, it’s creating standard lengths of this tab.