cursor always in the fist line of text
#### Steps to reproduce:
<!-- Describe what you did (step-by-step) so we can reproduce: -->
- open [TextBug.svg](/uploads/d3112da0e389cba20f2c873e53070d05/TextBug.svg)
- mark something in the second or third line of text
#### What happened?
The cursor is always in the first line:
#### What should have happened?
The cursor should be in the correct line
#### Inkscape Version and Operating System:
- Inkscape Version: Inkscape 0.92.4 (5da689c313, 2019-01-14)
- Operating System: MS Windows 10.0.17763.437 (aswell on Ubuntu 18.04)
#### Example file
<!-- Example file:
Attach a sample file (or files) highlighting the issue, if appropriate. -->
```svg
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.1//EN" "http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd">
<svg width="299mm" height="422mm" xmlns="http://www.w3.org/2000/svg" font-family="DejaVu Sans,sans-serif" font-size="32">
<text x="51" y="1316.36"><tspan x="51" y="1316.36" font-weight="700">SOME TEXT</tspan> <tspan x="51" y="1356.36">another characters</tspan><tspan x="51" y="1396.36">I do not know what to write</tspan></text>
</svg>
```
[TextBug.svg](/uploads/d3112da0e389cba20f2c873e53070d05/TextBug.svg)
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issue
