Hi, thanks for the report!

I can't reproduce this (same version of macOS and Chrome). Does this still reproduce in a clean profile/Incognito? Is this every text field, or just specific ones?

I tried it on a Guest profile and in an Incognito window with the same result. It seems to be every text field within the webpage (I made a test page using input types of text, textarea, email, search).

I should have noted that other MacOS text selection shortcuts work as expected, including SHIFT-LEFT to select a character at a time, and SHIFT-CMD-LEFT to select from the cursor to the beginning of the line.

In case it matters, this is also on a brand new Apple MBP with latest OS and all updates and a brand new user account (e.g. not a transfer but starting fresh).

Happy to provide more info as needed.

Thank you for providing more feedback. Adding the requester to the cc list.

For more details visit https://www.chromium.org/issue-tracking/autotriage - Your friendly Sheriffbot

Unable to reproduce the issue on reported chrome version #68.0.3440.106 and on latest chrome version #70.0.3522.0 using Mac OS 10.13.6, by following below steps.

Steps:
=====
1.Launched chrome.
2.Navigated to google.com.
3.Entered 'test test' in the the search box.
4.By using the keyboard shortcut 'option+shift+left', observed that the second test gets selected first later first test gets selected.
Note: Tried with incognito mode and by creating a new profile, but unable to reproduce the issue.

Attached screencast fo reference.
@Reporter: Could you please review the attached screen-cast and confirm if anything being missed here and request you to retry this issue with fresh profile without any extensions/apps or reset all the flags and let us know if issue still persists.

Thanks.!

Deleted: 874219.mp4 1.1 MB

	874219.mp4 1.1 MB View Download

Could you post the contents of "Variations" from chrome://version? Maybe there's an experiment enabled for you that's keeping us from reproducing.

If you have the opportunity/time could you also check if this is fixed for you in the latest Canary? https://www.google.com/chrome/canary/

I can't see your keystrokes, but I don't think you're missing anything.

I have tried with new profiles on Chrome 68.0.3440.106 and on Canary 70.0.3524.0. I reset all flags to defaults using chrome://flags. I turned off the extensions installed/enabled by default (Google Docs). Same behavior. Happy to record a screencast of it if useful.

Here is the output of Variations for Chrome and Canary-->

Chrome Variations (from chrome://version):
c134752e-1ece3553
59aeb88e-3f4a17df
1a0d11d4-ca7d8d80
ebeb14fc-3f4a17df
34a6bf44-ca7d8d80
752a9400-3d47f4f4
bacf97b2-ca7d8d80
241fff6c-1623a499
3095aa95-3f4a17df
7c1bc906-f55a7974
47e5d3db-3d47f4f4
125b7f68-26e7b859
1149accc-3f4a17df
4dc30737-b8a5ea08
a582a1b8-ad75ce17
3042ad4b-ca7d8d80
ebbb4e0a-ca7d8d80
44827ee5-3f4a17df
9eab0f00-3f4a17df
d0ecf1da-52a3491f
8f1e27f-ca7d8d80
9773d3bd-f23d1dea
43f62d3b-28165b59
9e5c75f1-b6621078
f79cb77b-3d47f4f4
e5218ffe-ca7d8d80
4ea303a6-ecbb250e
bcc34a89-3f4a17df
2c1d398c-ca7d8d80
6973a1cf-3f4a17df
58a025e3-36e97b2c
2a32876a-ca7d8d80
ff29b1bd-37ef7e17
da460ac8-3f4a17df
4bc337ce-b2a7d6c5
9a2f4e5b-3fe32955
1354da85-ca7d8d80
17507c76-ca7d8d80
494d8760-52325d43
f47ae82a-746c2ad4
3ac60855-486e2a9c
f296190c-dda7873d
4442aae2-a90023b1
ed1d377-e1cc0f14
12e17bc5-e1cc0f14
75f0f0a0-a5822863
e2b18481-7158671e
e7e71889-e1cc0f14
b1ceb06f-d1372334
3a4029d-ca7d8d80
94e68624-803f8fc4
8834fcca-ca7d8d80

Canary Variations:
c134752e-95b424ac
2c707b42-5940ee21
411b6d4e-f23d1dea
fe69e053-f23d1dea
9d7f502c-d5d68bac
d01ab0d3-ca7d8d80
3e006338-3f4a17df
1a0d11d4-f23d1dea
16e0dd70-3f4a17df
ebeb14fc-3f4a17df
b7e2524c-f23d1dea
3cd9377c-aed099c4
da89714-4ad60575
64da5c1e-f23d1dea
8982496f-ca7d8d80
b1681d28-1410f10
61832c80-f23d1dea
cc20827f-ca7d8d80
9041608a-3f4a17df
5852bcb0-f23d1dea
241fff6c-444559b8
afb5d7b8-f23d1dea
9853922b-c200976c
6025934e-3f4a17df
7c1bc906-86bf56d9
47e5d3db-3d47f4f4
125b7f68-26e7b859
d442dfb7-41afa35c
9ca1387e-f23d1dea
1149accc-3f4a17df
34d450b1-e9aea2ba
a582a1b8-ad75ce17
495970ba-6fc99f5e
3042ad4b-f23d1dea
249dd49a-f23d1dea
ac6e1b9-d93a0620
44827ee5-f23d1dea
d0ecf1da-9ebb8c3a
edbcf7c5-2d3ce014
5485fc4d-3f4a17df
9773d3bd-ca7d8d80
93731dca-585ca4c0
41f007f9-41f007f9
9b4c4257-6ad6e56e
43f62d3b-f23d1dea
c992f345-4ad60575
9e5c75f1-cf6200b9
6fa07eb4-ca7d8d80
f2fd8aaf-f23d1dea
f79cb77b-3d47f4f4
7a5ba892-f23d1dea
d1cd70a5-36012f6a
4ea303a6-e2ca4846
6e6e0c7e-bfd1fe3
95876445-ca7d8d80
d92562a9-6014a724
74c3667-6ab49ebf
dc5b1f29-f23d1dea
2c1d398c-3f4a17df
cc54eb06-f23d1dea
58a025e3-36e97b2c
ad6d27cc-7075cd8
df072bba-ca7d8d80
ff29b1bd-f21dcc16
5a42b5d9-3f4a17df
344833e9-1525b35b
4bc337ce-4077d4f3
9a2f4e5b-556b4118
494d8760-52325d43
3ac60855-486e2a9c
f296190c-fd6d2f5a
4442aae2-d7f6b13c
ed1d377-e1cc0f14
12e17bc5-e1cc0f14
75f0f0a0-d7f6b13c
e2b18481-75cb33fc
e7e71889-e1cc0f14
f9e5da91-f23d1dea
5e60f31d-803f8fc4
6e3b857e-1410f10
6a51bb09-ca7d8d80
308674c4-ca7d8d80
94e68624-f23d1dea
cc73f8a1-a2d707c6
de384ee6-7652bd75
b4e8892d-3f4a17df
8834fcca-cf4f6ead

Just out of curiosity, does any of you have a 2018 Macbook Pro to test on? That's the only thing unusual about this machine for me (though this is the only issue I've noticed with any app).

Thank you for providing more feedback. Adding the requester to the cc list.

For more details visit https://www.chromium.org/issue-tracking/autotriage - Your friendly Sheriffbot

Just in case, I compared key codes between this machine and an older Macbook Pro, and with an external Apple keyboard, and they all match. I also verified that the external keyboard works the same (in this regard) as the built-in keyboard.

After a ton of testing/experimentation, I seem to have isolated a set of conditions that can reproduce this bug (and relieve it)---at least for me. 

My first clue came when I created a new MacOS user and loaded Chrome, only to find that OPTION-SHIFT-LEFT worked as expected. I then went about trying to adjust system settings a bit at a time (as I would on any new account) until I broke it. Once I found a setting that triggered the problem, I realized that all along OPTION-SHIFT-LEFT was working on any new load of Chrome, but only for about 5-10 seconds. Then, it would quit working for good. Quit/Reload would give me another 5-10 seconds.

The offending MacOS setting, somehow, is the way I (re)set two default system shortcuts for MacOS Mission Control. For many years I have always set the 'Move left/right a space' shortcuts to OPT-LEFT and OPT-RIGHT (instead of the default CTRL-LEFT and CTRL-RIGHT). Yet for some reason, on this machine, setting to OPT-LEFT/RIGHT sets up conditions that break OPT-SHIFT-LEFT/RIGHT text selection *only* in Chrome webpage inputs (but not anywhere else in the system, or in any other browser or even in the Chrome location bar input). 

Here are the steps I have now verified several times that will make the bug start and stop:

	1.	Create new user with Users & Groups system preference pane (I used administrative rights)
	2.	Login as the new user (no need to logout current user)
	3.	Open Chrome
	4.	Don’t sign in
	5.	Go to google.com
	6.	Type ‘test test’ in the search box (or, really, in any webpage text input anywhere)
	7.	Test OPTION-SHIFT-LEFT to highlight the words in the search box one at a time
	8.	Do it over and over for at least 10-15 seconds to verify it works that long
	9.	Go to the Keyboard system preference pane and select Shortcuts tab
	10.	Select Mission Control in left tab
	11.	Click the default shortcut for ‘Move left a space’ (^<— aka CTRL-LEFT)
	12.	Reset the shortcut to OPTION-LEFT by pressing those keys
	13.	Reset the shortcut for ‘Move right a space’ to OPTION-RIGHT
	14.	Go to Chrome, test OPTION-SHIFT-LEFT for 10-15 seconds to verify it still works (it should)
	15.	Quit Chrome
	16.	Open Chrome
	17.	Go to google.com
	18.	Type ‘test test’ in the search box
	19.	Repeatedly and quickly test OPTION-SHIFT-LEFT (e.g. opt-shift-left, then lift up, then press right arrow to move cursor back to end, and repeat). It will work for about 5-10 seconds and then stop working. Closing/reopening Chrome will allow you to get another 5-10 seconds or so before it stops.
	20.	Go back to Keyboard preferences Shortcut tab, and select ‘Restore Defaults’ to set the shortcuts back to defaults.
	21.	Quit Chrome, open Chrome
	22.	Go back to google.com, type ‘test test’ and once again test OPTION-SHIFT-LEFT. It will work indefinitely again.

I have tested this formula over and over now, and am finding it repeatable. If it would be helpful for me to screen record a demo, I'd be happy to. 

bgrosser@: Many thanks for the detailed steps to reproduce the issue.

I can confirm that I am able to reproduce it with your described steps.

This is really strange. I am wondering why it is only breaking the shortcut when you focus a textfield of the web content and not when you focus the Omnibox?

Not sure, but may be this is a blink issue?

(+erikchen@, maybe you have an idea what is going on here - thanks :) )

Unable to reproduce the issue after following all steps mentioned in comment#10 ,on chrome version #68.0.3440.106 using Mac OS 10.13.6.

Attached screencast for reference.
@reporter:Could you please review the screencast and let us know if anything is being missed here so that it would be really helpful for further triaging.If possible please provide screencat for better undestanding of issue.

Thanks.!

Deleted: 874219.new.mp4 3.2 MB

	874219.new.mp4 3.2 MB View Download

This is likely caused by: 
https://cs.chromium.org/chromium/src/content/browser/renderer_host/render_widget_host_view_cocoa.mm?type=cs&q=renderwidgethostviewcocoa&sq=package:chromium&g=0&l=631

We have some kind-of-janky code to detect if a key is reserved by the system. If so, we don't send it to the renderer. I've wanted to do something more clever/robust but that would take a more thorough investigation and time. Given that the current code seems to work well enough for most users [with default system hotkeys], I'm going to mark this as Available, Pri-3.

Thanks for your feedback and the clarification.

swarnasree.mukkala asked for a screencast, so here is one where I demonstrate and discuss the bug. Thanks everyone!

Deleted: chrome-selection-bug-demo-SD 480p.mov 8.4 MB

	chrome-selection-bug-demo-SD 480p.mov 8.4 MB View Download

BTW, I just realized that there is a kind of workaround that may also help illuminate the problem. 

As long as my MacOS Mission Control keyboard shortcuts are at the default when I first open Chrome, then the SHIFT-OPTION-LEFT text selection will work indefinitely, even when I change my 'move to next space' shortcuts to OPTION-LEFT/RIGHT. In other words, Chrome windows and tabs --- even *new* windows and tabs --- will not have this bug until Chrome is quit and started anew when the custom shortcuts are in place.

So it seems that somehow, whatever is causing the bug in Chrome, it must be dependent on what the system shortcuts are set to when Chrome is opened (?)