Bug 419830

Summary:	Incorrect Thumbnail on both Group/Raster layer
Product:	[Applications] krita	Reporter:	Nick Mok <ex_hunter>
Component:	Dockers	Assignee:	Krita Bugs <krita-bugs-null>
Status:	RESOLVED DUPLICATE
Severity:	normal	CC:	ahab.greybeard, penguinflyer2222, tamtamy.tymona
Priority:	NOR
Version First Reported In:	nightly build (please specify the git hash!)
Target Milestone:	---
Platform:	Microsoft Windows
OS:	Microsoft Windows
Latest Commit:		Version Fixed/Implemented In:
Sentry Crash Report:
Attachments:	Layer thumbnails for initial painting Layer Thumbnails after painting and erasing content

Description Nick Mok 2020-04-08 08:10:14 UTC

SUMMARY
Thumbnail bounding box became incorrect after some manipulation.


STEPS TO REPRODUCE (case 1 - Group Layer)
1. Create a group layer containing two pixel layers (A,B) with some shapes in it.
2. Pick a pixel layer A
3. "Edit" > "Fill with Background/Foreground color". (Now group Thumbnail show full canvas)
4. "Edit" > "Clear" that pixel layer A. 
5. Observe that Group thumbnail still showing full canvas.

STEPS TO REPRODUCE (case 2 - Pixel Layer)
1. Draw anything
2. Flip the layer horizontally using Transform's Mirror function.


OBSERVED RESULT
Bounding box is showing the full canvas instead of clipped to the visible pixels.

EXPECTED RESULT
Group/Pixel Layer should show correct clipped content instead of full canvas or or distorted / incorrect bounding box.

SOFTWARE/OS VERSIONS

Tested on: 
-krita 2.4.9 
-krita-nightly-x64-v4.3.0-prealpha-2452-gea68cde0f9.zip

Windows: 10

ADDITIONAL INFORMATION

https://krita-artists.org/t/bug-group-layer-thumbnail-not-clipped-under-certain-situation/5169

Comment 1 Ahab Greybeard 2020-04-08 10:16:59 UTC

Created attachment 127381 [details]
Layer thumbnails for initial painting

I can confirm this for the 4.2.9 appimage.
I attach Initial-Thumbnails.png whuch shows correct thumbnail images.

After painting a small red blob in the top right corner of Layer 5 and then carefully erasing that painted blob, the thumbmails for Layer 5 and the group Layer 6 shows thumbnails as if the erased blob was still there as shown in:
Shifted-Thumbnails.png attached.

Setting to Confirmed

Comment 2 Ahab Greybeard 2020-04-08 10:17:43 UTC

Created attachment 127382 [details]
Layer Thumbnails after painting and erasing content

Comment 3 Tiar 2020-11-07 20:08:47 UTC

It's not really the thumbnail's fault, but the Fill Tool algorithm - filling everything and then cutting off the unimportant parts, but still changing the boundary of the layers - and the general reluctance of Krita to trim off empty image tiles (sections).

Comment 4 Freya Lupen 2023-06-20 22:59:26 UTC


*** This bug has been marked as a duplicate of bug 459273 ***