Ubuntu – Can’t change text size in gedit

This not the best way as it involves changing the size for all applications, but it's the only way I know.

• Press Alt + F2 and type gnome-appearance-properties.
• Start the Appearance Preferences application from the search result.
• Go to the Fonts tab.
• Change the Application Fonts font settings.

Find the solution myself:

It was a style (theme) problem. Checked again using the default theme and this behave as expected. So I inspected carefully the other themes and found that not all those themes had this problem.

The solution was to edit the theme's code (twilight.xml) to insert the following lines:

<style name="selection" background="orange" />
<style name="selection-unfocused" foreground="white" background="gray" />

By the way, the location of the themes in gEdit 3 differ from gEdit 2. Here it is:

~/.local/share/gtksourceview-3.0/styles/

You can create the directory yourself if it doesn't exist. Further info on style paths here: http://live.gnome.org/GtkSourceView/StyleSchemes