Shift-Space inserts nobreakspace

[aguettinger]

I recently had some problems when coding C which turned out that special characters were inserted in my C code which the compiler didn't like.
When investigating I realized that the characters come from nobreakspaces. Apparently when using shift-space I insert nobreakspaces. After looking around a bit this should happen when I do CTRL-SHIFT-SPACE, but now it also does that with Shift-Space. Maybe something is wrong with my keyboard mappings, although everything else is working correctly. Any ideas of how to get rid of this behavior?

Here is a short text file shown in scite:

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NEW IN TOWN
NEW IN TOWN
           
NEW IN TOWN
NEW IN TOWN

1. line: only space
2. line: holding shift while entering the whole line
3. line: repeatedly typing shift-space
4. line: same as 2.
5. line: using Ctrl-Shift-Space

The same file with cat test.txt in terminal:

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NEW IN TOWN
NEW IN TOWN
           
NEW IN TOWN
NEW IN TOWN

xev output when doing shift-space:

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KeyPress event, serial 33, synthetic NO, window 0x2000001,
    root 0x1a7, subw 0x0, time 32029260, (524,-60), root:(583,38),
    state 0x0, keycode 62 (keysym 0xffe2, Shift_R), same_screen YES,
    XLookupString gives 0 bytes: 
    XmbLookupString gives 0 bytes: 
    XFilterEvent returns: False

KeyPress event, serial 33, synthetic NO, window 0x2000001,
    root 0x1a7, subw 0x0, time 32031172, (524,-60), root:(583,38),
    state 0x1, keycode 65 (keysym 0xa0, nobreakspace), same_screen YES,
    XLookupString gives 2 bytes: (c2 a0) " "
    XmbLookupString gives 2 bytes: (c2 a0) " "
    XFilterEvent returns: False

KeyRelease event, serial 33, synthetic NO, window 0x2000001,
    root 0x1a7, subw 0x0, time 32031308, (524,-60), root:(583,38),
    state 0x1, keycode 65 (keysym 0xa0, nobreakspace), same_screen YES,
    XLookupString gives 2 bytes: (c2 a0) " "
    XFilterEvent returns: False

KeyRelease event, serial 33, synthetic NO, window 0x2000001,
    root 0x1a7, subw 0x0, time 32031636, (524,-60), root:(583,38),
    state 0x1, keycode 62 (keysym 0xffe2, Shift_R), same_screen YES,
    XLookupString gives 0 bytes: 
    XFilterEvent returns: False