Chrome's task manager doesn't appear when using the Shift+Escape shortcut keys

...but does work when selected from the menu.
There are (or used to be?) problems with some sites like GMail, however Shift + Esc didn't work for me anywhere.
As helpfully suggested by Bruce at https://bugs.chromium.org/p/chromium/issues/detail?id=317276#c15 , if you've got Intel Management and Security stuff on your machine then by default it will have usurped the shortcut.  Change it in the Intel settings.

SharePoint 2013 CSOM: Prevent last-modified and last-modified-by (or whatever they're called) from changing when updating programmatically.

Simply doing a
sharePointItem["Editor"] = sharePointItem["Editor"];
sharePointItem["Modified"] = sharePointItem["Modified"];
before the
sharePointItem.Update();
context.ExecuteQuery();
seemed to work for me on a Document Library.  

(I tried "Last_x0020_Modified" first which I got from a list of fields somewhere and that gives an error about..."not existing or might be read-only"?)

Also note that there appear to be other "modified"-type fields on a Document Library that might be for search, but I haven't felt the need to understand those.