I get no preview of what color the Eyedropper is picking. On the other hand, I do get it when using Alt (or Ctrl) with the Brush. (I have an additional keybinding for Alt as well as Ctrl, which is not what I am used to.) The preview is a small square box when using Alt and serves the purpose. There is nothing with the Eyedropper.
There is a way to preview the color of the Eyedropper: Zoom until the pixels are big enough, even bigger than the tool icon. Otherwise, there is no key to show the color the Eyedropper is over. Is the zoom solution enough or a key is also needed?
Zooming isn't viable. You are drawing and want to change the color. Zooming would completely interfere. It doesn't need a key. It needs to show the preview when the eyedropper touches the screen, the same as it does with Ctrl. All drawing programs work that way. Without a preview, you don't know if you have picked the right color.
Confirmed then, it should show the color picked in a small square box.
Yes, it does not do that.
A possibly relevant merge request was started @ https://invent.kde.org/graphics/krita/-/merge_requests/1017
Git commit beb3b2d5e96b443ec5f28c300397176de29ae841 by Halla Rempt, on behalf of Reinold Rojas. Committed on 23/09/2021 at 09:41. Pushed by rempt into branch 'master'. Enable color sample preview for Color Sample Tool Add a small square box that shows the current color and the sampled color when using the Color Sample Tool. This is similiar functionality to using the color sample shortcut M +73 -3 plugins/tools/basictools/kis_tool_colorsampler.cc M +9 -0 plugins/tools/basictools/kis_tool_colorsampler.h https://invent.kde.org/graphics/krita/commit/beb3b2d5e96b443ec5f28c300397176de29ae841
Git commit c8b5bfc3c4d65751547a46bb5b8281ad578c5ab6 by Halla Rempt, on behalf of Reinold Rojas. Committed on 23/09/2021 at 09:41. Pushed by rempt into branch 'master'. Make preview rect disappear when moving off canvas Fixed the preview rectangle lingering on the canvas when the mouse was moving off screen. M +61 -31 plugins/tools/basictools/kis_tool_colorsampler.cc M +10 -0 plugins/tools/basictools/kis_tool_colorsampler.h https://invent.kde.org/graphics/krita/commit/c8b5bfc3c4d65751547a46bb5b8281ad578c5ab6
Git commit 7d5241248d207f540bd51b63ca3ad63a845384d3 by Halla Rempt, on behalf of Reinold Rojas. Committed on 23/09/2021 at 09:42. Pushed by rempt into branch 'krita/5.0'. Enable color sample preview for Color Sample Tool Add a small square box that shows the current color and the sampled color when using the Color Sample Tool. This is similiar functionality to using the color sample shortcut (cherry picked from commit beb3b2d5e96b443ec5f28c300397176de29ae841) M +73 -3 plugins/tools/basictools/kis_tool_colorsampler.cc M +9 -0 plugins/tools/basictools/kis_tool_colorsampler.h https://invent.kde.org/graphics/krita/commit/7d5241248d207f540bd51b63ca3ad63a845384d3
Git commit eacaa74037cd7357b06cc0e17b06eb301b02319c by Halla Rempt, on behalf of Reinold Rojas. Committed on 23/09/2021 at 09:42. Pushed by rempt into branch 'krita/5.0'. Make preview rect disappear when moving off canvas Fixed the preview rectangle lingering on the canvas when the mouse was moving off screen. (cherry picked from commit c8b5bfc3c4d65751547a46bb5b8281ad578c5ab6) M +61 -31 plugins/tools/basictools/kis_tool_colorsampler.cc M +10 -0 plugins/tools/basictools/kis_tool_colorsampler.h https://invent.kde.org/graphics/krita/commit/eacaa74037cd7357b06cc0e17b06eb301b02319c