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Text Editor - Pasting text kills undo steps
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Description

System Information
Operating system: Windows 10 Build 1803
Graphics card: Nvidia GTX 1080

Blender Version
Broken: 2.80 Beta Windows 64 bit Build December 10, 15:54:24 - 9fa408f51b7

Existing text pasted over by Ctrl-V is irretrievable with undo. See video for demonstration.
During recording, Global Undo was enabled (default) and Undo Step was at 256. With lower undo steps, same result only a much shorter undo history

A blend file with simple instructions follows.

Exact steps for others to reproduce the error

  1. Create a new text block and write a few separate lines
  2. Copy the text from one line
  3. Paste over another line
  4. Try to recover the text with Undo