[Github-comments] [geany/geany] Gtk-Warning at startup when opened file contains a long line (#2700)

[nomadbyte]

Geany 1.38 shows a Gtk-Warning at startup

```
(geany:29297): Gtk-WARNING **: 00:58:33.911: Negative content height -6 (allocation 1, extents 7x0) while allocating gadget (node scrollbar, owner GtkScrollbar)
```
This seems to be triggered when:
1. the file being opened at startup contains a long current (saved) line that stretches beyond the current window size (in this case it was maximized)
2. AND the Line wrapping is enabled in preferences (Preferences>Editor[Features]:Line wrapping)

Geany starts and opens the file Ok, however the line in question appears non-wrapped, yet it's expected to be.

---------------

```
geany -V
geany 1.38 (built on 2020-12-19 with GTK 3.22.30, GLib 2.56.4)

uname -a
Linux testbox 5.4.0-58-generic #64~18.04.1-Ubuntu SMP Wed Dec 9 17:11:11 UTC 2020 x86_64 x86_64 x86_64 GNU/Linux
```


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