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[Martin Saturka <1712442@xxxxxxxxxxxxxxxxxx>]

Public bug reported:

Ubuntu 16.04.3 LTS, fonts-dejavu 2.35-1,
mono underscore character is shown as space, issue seen:

* first noticed at Tcl/Tk applications, see this
https://core.tcl.tk/tk/tktview/6386ce66a48d530747763d5fa97d3c96f8584f73
(14pixel-sized mono font) and this
https://core.tcl.tk/tk/tktview/d4e20ca3dc tickets there;

* then I've met this font bug at Geany: DejaVu Sans Mono: 14, 17, all
styles, and alike for Bitstream Vera Sans Mono at 14/17 sizes; set
editor fonts (in preferences/interface) to these fonts, underscore
disappears.

Since it is both at a Gtk application (Geany) and Tcl/Tk applications, it should be a font issue. It seems that DejaVu Sans Mono have generally issues, thus setting some another font as the system default Mono font would be reasonable (Liberation Mono seems to work properly).
Notice that mono fonts are commonly used for programming, and underscores are common in code, thus it is quite a problem to have spaces instead of underscores in system default mono font.

** Affects: fonts-dejavu (Ubuntu)
     Importance: Undecided
         Status: New

** Description changed:

  Ubuntu 16.04.3 LTS, fonts-dejavu 2.35-1,
  mono underscore character is shown as space, issue seen:
  
- * first noticed at Tcl/Tk applications, see <a href="https://core.tcl.tk/tk/tktview/6386ce66a48d530747763d5fa97d3c96f8584f73";>this</a> (14pixel-sized mono font) and <a href="https://core.tcl.tk/tk/tktview/d4e20ca3dc";>this</a> tickets there;
- * then I've met this font bug at Geany: DejaVu Sans Mono: 14, 17, all styles, and alike for Bitstream Vera Sans Mono at 14/17 sizes; set editor fonts (in preferences/interface) to these fonts, underscore disappears.
+ * first noticed at Tcl/Tk applications, see this
+ https://core.tcl.tk/tk/tktview/6386ce66a48d530747763d5fa97d3c96f8584f73
+ (14pixel-sized mono font) and this
+ https://core.tcl.tk/tk/tktview/d4e20ca3dc tickets there;
+ 
+ * then I've met this font bug at Geany: DejaVu Sans Mono: 14, 17, all
+ styles, and alike for Bitstream Vera Sans Mono at 14/17 sizes; set
+ editor fonts (in preferences/interface) to these fonts, underscore
+ disappears.
  
  Since it is both at a Gtk application (Geany) and Tcl/Tk applications, it should be a font issue. It seems that DejaVu Sans Mono have generally issues, thus setting some another font as the system default Mono font would be reasonable (Liberation Mono seems to work properly).
  Notice that mono fonts are commonly used for programming, and underscores are common in code, thus it is quite a problem to have spaces instead of underscores in system default mono font.

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https://bugs.launchpad.net/bugs/1712442

Title:
  Underscore not shown at some DejaVu mono fonts

Status in fonts-dejavu package in Ubuntu:
  New

Bug description:
  Ubuntu 16.04.3 LTS, fonts-dejavu 2.35-1,
  mono underscore character is shown as space, issue seen:

  * first noticed at Tcl/Tk applications, see this
  https://core.tcl.tk/tk/tktview/6386ce66a48d530747763d5fa97d3c96f8584f73
  (14pixel-sized mono font) and this
  https://core.tcl.tk/tk/tktview/d4e20ca3dc tickets there;

  * then I've met this font bug at Geany: DejaVu Sans Mono: 14, 17, all
  styles, and alike for Bitstream Vera Sans Mono at 14/17 sizes; set
  editor fonts (in preferences/interface) to these fonts, underscore
  disappears.

  Since it is both at a Gtk application (Geany) and Tcl/Tk applications, it should be a font issue. It seems that DejaVu Sans Mono have generally issues, thus setting some another font as the system default Mono font would be reasonable (Liberation Mono seems to work properly).
  Notice that mono fonts are commonly used for programming, and underscores are common in code, thus it is quite a problem to have spaces instead of underscores in system default mono font.

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