"@Inhouse: As the issue needs to be checked by logging in to KDE Plasma with OS Kubuntu 17.10, requesting some one from in house team to have a look into it and help in further investigation.

Hence adding label : TE-NeedsTriageFromHYD

Thanks!"

Unable to reproduce on Chrome 63.0.3239.84 using the Breeze GTK theme.
+thestig are you seeing this issue?

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re: comment 5 - but are you using the same version of KDE as the one shipped with Kubuntu 17.10?

I gave it a try with Kubuntu live and I'm still unable to repro.
OP, are you using any special DPI or scaling settings?

> OP, are you using any special DPI or scaling settings?

I tested different scaling settings on my UHD screen and tested it in a VM with FHD & without scaling.

I noticed that chrome is NOT maximized on your screenshot, did you test that? This bug occurs only when chrome is miximized.

c#8: Thanks, able to reproduce when the window is maximized

Also notice, that the button in the middle should change when the window is maximized.

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The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/19eee98dfd576b4c9fc5b4e59ab2ec41c381cbe4

commit 19eee98dfd576b4c9fc5b4e59ab2ec41c381cbe4
Author: Tom Anderson <thomasanderson@chromium.org>
Date: Tue Jan 02 22:11:55 2018

Gtk3: Fix Breeze theme unmaximize button

GTK windows have the .maximized class applied when they are maximized.  Child
widgets may be styled differently depending on this state, as the Breeze theme
does with the unmaximize button.

Unlike other themes, the Breeze theme uses a bitmap to render the titlebuttons,
so it was the only theme so far affected by this issue.  With this fix, the
unmaximize button looks like a diamond instead of an up arrow.

BUG= 794358 
R=thestig@chromium.org

Change-Id: I462d78665e3d1e30d05535af632415c981f3f432
Reviewed-on: https://chromium-review.googlesource.com/842857
Reviewed-by: Elliot Glaysher <erg@chromium.org>
Commit-Queue: Thomas Anderson <thomasanderson@chromium.org>
Cr-Commit-Position: refs/heads/master@{#526541}
[modify] https://crrev.com/19eee98dfd576b4c9fc5b4e59ab2ec41c381cbe4/chrome/browser/ui/libgtkui/nav_button_provider_gtk3.cc

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/7df10e3bf7ecd845801f06b4b06b5f7bc39cf79b

commit 7df10e3bf7ecd845801f06b4b06b5f7bc39cf79b
Author: Tom Anderson <thomasanderson@chromium.org>
Date: Wed Jan 03 05:46:47 2018

Gtk3: Fix Breeze theme frame buttons clipping

BUG= 794358 

Change-Id: I48f8e5a6f129734a76fad5622bd1680c4946dffe
Reviewed-on: https://chromium-review.googlesource.com/847680
Reviewed-by: Elliot Glaysher <erg@chromium.org>
Commit-Queue: Thomas Anderson <thomasanderson@chromium.org>
Cr-Commit-Position: refs/heads/master@{#526631}
[modify] https://crrev.com/7df10e3bf7ecd845801f06b4b06b5f7bc39cf79b/chrome/browser/ui/libgtkui/nav_button_provider_gtk3.cc

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/b89ec1819efbb2cbec603db94a07229a098f2bb0

commit b89ec1819efbb2cbec603db94a07229a098f2bb0
Author: Tom Anderson <thomasanderson@chromium.org>
Date: Wed Jan 03 06:38:30 2018

Gtk3: Fix fuzzy breeze frame buttons when using scale factors > 1

When using scale factors > 1, it is necessary to set the scale factor on all
GtkStyleContext's so that GTK will fetch higher resolution assets.

This was only seen on the Breeze theme, because it's the only one that uses
bitmap backgrounds.

BUG= 794358 
R=erg@chromium.org

Change-Id: Ib2c42e4869156caba94f377b583cbac96f44ad98
Reviewed-on: https://chromium-review.googlesource.com/847683
Reviewed-by: Elliot Glaysher <erg@chromium.org>
Commit-Queue: Thomas Anderson <thomasanderson@chromium.org>
Cr-Commit-Position: refs/heads/master@{#526638}
[modify] https://crrev.com/b89ec1819efbb2cbec603db94a07229a098f2bb0/chrome/browser/ui/libgtkui/gtk_util.cc

KDE plasma set up is unavailable with HYD chrome-TE team. Requesting someone from MTV team to verify this issue.

Thanks!

Should be fixed in Chromium 65 or later.

Note that in maximized mode, the icons will appear slightly smaller because the Breeze theme reports the button size to be taller than it actually is, so it gets downsized for the smaller tabstrip.  I've created a patch here https://github.com/KDE/breeze-gtk/pull/3#issuecomment-355097411  But I'm having trouble creating a KDE identity account, so it has not landed yet.

Thanks! Now if there were canary builds for Linux, I could enjoy the fix right now :) *wink* https://bugs.chromium.org/p/chromium/issues/detail?id=622061

 Issue 814622  has been merged into this issue.