[digikam] [Bug 381414] New: [idea] Reduce opacity of grouped, expanded thumbnails to indicate group

[Jens]

https://bugs.kde.org/show_bug.cgi?id=381414

            Bug ID: 381414
           Summary: [idea] Reduce opacity of grouped, expanded thumbnails
                    to indicate group
           Product: digikam
           Version: 5.6.0
          Platform: Other
                OS: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: NOR
         Component: Thumbnails
          Assignee: digikam-devel at kde.org
          Reporter: jens-bugs.kde.org at spamfreemail.de
  Target Milestone: ---

This is a follow-up to Bug 361047.

Currently, when a group is expanded, it is not visually clear which images
belong to the group. The original idea of changing the background color of such
a group does not play well with different themes, and it also does not help
with multiple opened groups (then all expanded images will have the same
background color).

A different idea would be to reduce the opacity of opened grouped thumbnails to
e. g. 50 percent but only(!) while the mouse is (!) over the *main* group
thumbnail. This does not affect visibility of the thumbnails during normal
usage, it indicates clearly what is grouped, each group can be visualized
separately, and it does not interfere with color schemes. Also, it creates the
possibility of correctly sorting grouped images in between non grouped ones
when the group is opened.

This is slightly different from the idea in comment 76 of the above bug report
which requested the opacity reduction when *not* hovering over one of the
group. But doing it like that would again create the issue that multiple
expanded groups cannot be told apart which would be confusing.

If reduced opacity is not an option or too slow to compute, enlarging the
border of all expanded image thumbnails (significantly - like 3..5x as many
pixels) only when hovering above the main thumbnail would also be an option.

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