Panel doesn't (un)hide when switching lines

[md-work]

When Hide Panel When Empty is on and Panel Represents is set to Current Line, the panel doesn't (un)hide when switching between a line with and a line without error. (by mouse or by keyboard)

(un)hiding only seems to be triggered when switching to a different tab.

Tested with openSUSE-15.0, KDE-5.12, Atom-1.32 and some Ruby source code.

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Maybe related:

• Panel does not unhide when NOT empty in 1.7.0 #487 Panel does not unhide when NOT empty in 1.7.0
• Panel Represents: Current File doesn't work #507 Panel Represents: Current File doesn't work