This issue has been Available for over a year. If it's no longer important or seems unlikely to be fixed, please consider closing it out. If it is important, please re-triage the issue.

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+patricialor, can you verify if this is still an issue?

Yep, this behaviour is still an issue - I have a WIP to fix this here. https://chromium-review.googlesource.com/c/chromium/src/+/771050

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/ed10b0686bf7bb251375ddd0ff11c66c7cefeb21

commit ed10b0686bf7bb251375ddd0ff11c66c7cefeb21
Author: Patti <patricialor@chromium.org>
Date: Thu Nov 16 02:37:38 2017

Desktop Page Info/Harmony: Never decrease the size of PageInfoBubbleView.

The PageInfoBubbleView, when long strings are selected in its comboboxes, can
sometimes expand its original size in Harmony mode. It will then shrink again
if the long combobox option is changed back to a shorter one. This makes the UI
move around a lot, so prevent it from getting smaller again.

Bug: 657250
Change-Id: I49262900cc386ae2e57e02ba82a51cdae12e08a9
Reviewed-on: https://chromium-review.googlesource.com/771050
Reviewed-by: Lucas Garron <lgarron@chromium.org>
Commit-Queue: Patti <patricialor@chromium.org>
Cr-Commit-Position: refs/heads/master@{#516966}
[modify] https://crrev.com/ed10b0686bf7bb251375ddd0ff11c66c7cefeb21/chrome/browser/ui/views/page_info/page_info_bubble_view.cc

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/25cd20b5e89acf9fcc830799f9424cab1e226e15

commit 25cd20b5e89acf9fcc830799f9424cab1e226e15
Author: Patti <patricialor@chromium.org>
Date: Thu Feb 01 00:55:46 2018

Revert "Desktop Page Info/Harmony: Never decrease the size of PageInfoBubbleView."

This reverts commit ed10b0686bf7bb251375ddd0ff11c66c7cefeb21.

Reason for revert: This causes  crbug.com/795272 , but there isn't a good fix for this at the moment. Revert this as a workaround for now.

Original change's description:
> Desktop Page Info/Harmony: Never decrease the size of PageInfoBubbleView.
> 
> The PageInfoBubbleView, when long strings are selected in its comboboxes, can
> sometimes expand its original size in Harmony mode. It will then shrink again
> if the long combobox option is changed back to a shorter one. This makes the UI
> move around a lot, so prevent it from getting smaller again.
> 
> Bug: 657250
> Change-Id: I49262900cc386ae2e57e02ba82a51cdae12e08a9
> Reviewed-on: https://chromium-review.googlesource.com/771050
> Reviewed-by: Lucas Garron <lgarron@chromium.org>
> Commit-Queue: Patti <patricialor@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#516966}

TBR=lgarron@chromium.org,patricialor@chromium.org

# Not skipping CQ checks because original CL landed > 1 day ago.

Bug: 657250,  795272 
Change-Id: Ibbefa40b7dd32e1f69bdb04c4895594f053985a7
Reviewed-on: https://chromium-review.googlesource.com/894927
Reviewed-by: Patti <patricialor@chromium.org>
Reviewed-by: Raymes Khoury <raymes@chromium.org>
Commit-Queue: Patti <patricialor@chromium.org>
Cr-Commit-Position: refs/heads/master@{#533497}
[modify] https://crrev.com/25cd20b5e89acf9fcc830799f9424cab1e226e15/chrome/browser/ui/views/page_info/page_info_bubble_view.cc

Reopening since this was reverted, see  issue 795272 .