[dolphin] [Bug 447351] New: transparent images/formats have no visual indication about the file dimension, which leads to confusion when doing a drag operation

[Raghavendra kamath]

https://bugs.kde.org/show_bug.cgi?id=447351

            Bug ID: 447351
           Summary: transparent images/formats have no visual indication
                    about the file dimension, which leads to confusion
                    when doing a drag operation
           Product: dolphin
           Version: 21.08.3
          Platform: Other
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: general
          Assignee: dolphin-bugs-null at kde.org
          Reporter: raghu at raghukamath.com
                CC: kfm-devel at kde.org
  Target Milestone: ---

Created attachment 144760
  --> https://bugs.kde.org/attachment.cgi?id=144760&action=edit
screenshot showing transparent images in dolphin without file dimension border

In Dolphin transparent images and file formats which support transparent
thumbnails do not have any indication about their file dimensions. They just
show empty area around them. User has to guess the empty area between files
while doing a drag ans select operation. 

Jpg and other formats have nice shadow around them, but transparent images do
not have this. while this is inconsistent On vdg room I understood that this is
done to avoid ugly rectangle around icons. Having rectangle border around icons
would be odd and look ugly, I think there should be some indication of the
image area. 

Looking at macos and windows I see that they show a box around the element on
hover. Macos shows name and element in separate highlight box on hover. Our own
app gwenview also has this feature , it shows a blue box around the file
dimension on hover. I think having this box on hover would solve this issue of
user getting confused about the file dimension boundary.

I am attaching a screenshot of a scenario where I have few transparent png
images. Often common case when you render animation as png sequences. You can
see that it becomes hard to know where the image starts and where empty dolphin
window is to start a selection drag and not drag the image itself.

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