[gparted] Ensure SpinButtons have space to display 7 digits (#7)

[Mike Fleetwood <mfleetwo src gnome org>]

commit d626a636d377a4614c53decc2bdb9781098f4b8a
Author: Luca Bacci <luca bacci982 gmail com>
Date:   Tue Jan 22 14:27:38 2019 +0100

    Ensure SpinButtons have space to display 7 digits (#7)
    
    In Gtk2 the up and down buttons in a SpinButton were smaller leaving
    space for 7 digits before scrolling the entry.  In Gtk3 the up and down
    buttons are much larger leaving only space for 4 digits.  This occurs in
    the SpinButtons in the Dialog_Base_Partition class as displayed in the
    New Partition, Paste and Resize/Move dialogs.
    
    Set width-chars property of all Gtk::SpinButtons to ensure 7 digits can
    be displayed before scrolling the entry.
    
    Closes #7 - Port to Gtk3

 src/Dialog_Base_Partition.cc | 3 +++
 1 file changed, 3 insertions(+)
---
diff --git a/src/Dialog_Base_Partition.cc b/src/Dialog_Base_Partition.cc
index bfa278cb..4bf17d92 100644
--- a/src/Dialog_Base_Partition.cc
+++ b/src/Dialog_Base_Partition.cc
@@ -58,6 +58,7 @@ Dialog_Base_Partition::Dialog_Base_Partition()
                
        spinbutton_before .set_numeric( true );
        spinbutton_before .set_increments( 1, 100 );
+       spinbutton_before.set_width_chars(7);
        table_resize.attach( spinbutton_before, 1, 2, 0, 1, Gtk::FILL );
        
        //add spinbutton_size
@@ -65,6 +66,7 @@ Dialog_Base_Partition::Dialog_Base_Partition()
 
        spinbutton_size .set_numeric( true );
        spinbutton_size .set_increments( 1, 100 );
+       spinbutton_size.set_width_chars(7);
        table_resize.attach( spinbutton_size, 1, 2, 1, 2, Gtk::FILL );
        
        //add spinbutton_after
@@ -72,6 +74,7 @@ Dialog_Base_Partition::Dialog_Base_Partition()
        
        spinbutton_after .set_numeric( true );
        spinbutton_after .set_increments( 1, 100 );
+       spinbutton_after.set_width_chars(7);
        table_resize.attach( spinbutton_after, 1, 2, 2, 3, Gtk::FILL );
        
        if ( ! fixed_start )