examples/demo-scroll doesn't work on urxvt
Bug #1628977 reported by
Franz Fellner
This bug affects 1 person
| Affects | Status | Importance | Assigned to | Milestone | |
|---|---|---|---|---|---|
| libtickit |
New
|
Undecided
|
Unassigned | ||
Bug Description
It does not scroll. xterm works fine, as does pangoterm. demo-input recognizes Up/Down correctly, so I think scrolling should work.
xterm exports TERM=xterm, urxvt uses TERM=rxvt-
Though there seem to be other bugs in demo-scroll: It erases buffer content that left the window (in any terminal I tried). Is it supposed to do so? If not should I open a new report?
Revision history for this message
| Paul "LeoNerd" Evans (leonerd) wrote | #1 |
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> It does not scroll. xterm works fine, as does pangoterm. demo-input
> recognizes Up/Down correctly, so I think scrolling should work. xterm
> exports TERM=xterm, urxvt uses TERM=rxvt-
> (without 256color) also doesn't work.
That sounds entirely expected. The demo is actually just showing off the scrollrect method on a window, which will only work if the backing terminal supports VSSM. Only xterm/pangoterm are known to support VSSM. The terminfo driver doesn't even attempt it.
A real application would use fallback around the failed scrollrect and apply buffer redrawing, perhaps from a renderbuffer or similar.
> Though there seem to be other bugs in demo-scroll: It erases buffer
> content that left the window (in any terminal I tried). Is it supposed
> to do so? If not should I open a new report?
Indeed - again it's just a demo showing the onscreen blit operation that is scrollrect. Once the content has departed, it's gone forever. A more complete example would have some in-memory backing buffer of the content to redraw it again later.