Document Properties dialogue moves offscreen after repeated use
#### Steps to reproduce: - open Inkscape (no file needed) - click File - click Document Properties (note dialog position) - close dialog - click File - click Document Properties (notice new position) - repeat operation and dialog moves off the screen #### What happened? Document Properties dialog moves toward the right hand side of the screen every time the dialog is opened. #### What should have happened? Dialog should have opened in the middle of the screen or the same position it was in previously. #### Inkscape Version and Operating System: - Inkscape Version: Inkscape 0.92.4 (5da689c313, 2019-01-14) - Operating System: Windows 10 64-bit - Operating System version: Build 18362.239
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