[konsole] [Bug 456354] New text writes on top of sixel image instead of erasing part of the image

[bugzilla_noreply at kde.org]

https://bugs.kde.org/show_bug.cgi?id=456354

alexkurisu+github at posteo.us changed:

           What    |Removed                     |Added
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                 CC|                            |alexkurisu+github at posteo.us

--- Comment #3 from alexkurisu+github at posteo.us ---
(In reply to Matan Ziv-Av from comment #2)
> (In reply to badnam3o.0 from comment #0)
> > Created attachment 150416 [details]
> > different behaviours with sixel images of konsole and xterm vt340
> > 
> > in other terminals such as foot, mlterm and xterm (emulating vt-340) , when
> > new text is written where a sixel image is present, part of the image is
> > erased. In Konsole, the text is written on top of the image instead. The
> > erasing behaviour can be useful to TUI apps for deleting an image without
> > needing to clear the entire screen. 
> 
> This was a conscious decision by me. While the interaction between text and
> image you describe is common, or even universal, I do not think it was in
> any way defined formally in any standard.
> 
> In KDE, the default background color was always treated as transparent (see
> when a background image is used).
> 
> So an application may get the common behaviour of text hiding image by
> changing the background color to a similar color (like (1,1,1) instead of
> (0,0,0)), while having the option of mixing text and graphics.

Please, remove this change. Many applications rely on ability to erase sixels
by writing text over it.

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