Changing settings in Add Object Settings Pane reverts latest text edits
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Description

System Information
OS: Windows 7 Professional, SP1, 64 bit
Processor: Intel Core i7-2600 CPU @ 3.4GHz
RAM: 16 GB
Graphics card: ATI Radeon HD 3400

Blender Version
Broken: 2.78c Hash: e92f235283
Broken: 2.77a Hash: abf6f08

Short description of error
The latest change to text in the text editor is reverted when the Add Mesh Primitive input values change.

Exact steps for others to reproduce the error


Type text into the Text Editor
Add a Plane mesh object to the 3D View (Shift-A, M, P)
Change the Radius in the Add Plane pane in the bottom-left of the 3D view
The text you typed into the text editor should be gone now.

Details

Type
Bug

I confirm the problem on ubuntu 16.04 64bits

It seems that any redo in 3DView delete unsaved text in text editor.