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system: Kubuntu 19.04
kde plasma version: 5.15.4
kde frameworks version: 5.56.0
Qt version: 5.12.2
kernel: 5.0.0-29-generic
os type: 64-bit

when you close one tab in kate text editor (CTRL+W) , you can realize which button has the focus, meaby with a blue color (kde applications) or with a dotted line on the button. You can use left/right arow or TAB.

Kate text editor

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But in some applications (GTK+), is impossible to know so and left/right arrows or TAB doesn't work properly in these cases. For example in Firefox when you have more than one tab after close the app (ALT+F4).

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Similar in vscode, when you close one tab (CTRL+W).

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Is there a way to work around that behavior?
Is there a solution?, thanks in advance.

Update 17-01-2020
Operating System: KDE neon 5.17
KDE Plasma Version: 5.17.5
KDE Frameworks Version: 5.66.0
Qt Version: 5.13.2
Kernel Version: 5.0.0-37-generic
OS Type: 64-bit

vscode: 1.41.4

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On vscode TAB key, Left/Right Arrows key, ALT+underline letter works well.

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On Firefox only ALT key work but "close tabs" button never is colored, Arrows key doesn't work properly.

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1

It should be a problem with plasma's theme.

In plasma's settings, go to “Appearance” → “Application Style” → “GNOME Application Style (GTK)”, and change the GTK2 and GTK3's theme, you may find a working theme.

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