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The issue is that in certain situations, when selecting text in a very specific way (more below) and typing to overwrite it causes the insertion point to be positioned a few characters after the end of selection which puts part of the replacement to appear not where the original selection started.
The screencast shows the problem http://screencast.com/t/vjIZwFqsCz0
To reproduce this you need a mac machine, an apple touchpad and your OSX configured to register taps and clicks. In this mode there are two ways the OS interprets the taps - quick double-tap results in the word underneath the mouse cursor to be selected while a double-tap with a slightly longer pause between taps starts the selection mode in which you can slide your finger on the touchpad without depressing it or holding shift to select any amount of text.
After the above configuration is active you need to enter the selection mode by double-tap, select some text and start typing immediately. It should result in the issue presented above.
I think next time we met you need to show me how to do it.
Thanks so much for taking the time to submit this report! I attempted to reproduce this issue based on the bug description with the latest Visual Studio 2017 for Mac Preview version 7.1, and I was unable to hit the problem. If this issue is still occurring for you, please reopen this report.