Re: [Gimp-developer] Cyclic layer-group error when moving linked layers

On Fri, Aug 29, 2014 at 1:22 PM, Seldom Needy <needthistool gmail com> wrote:
I'll need someone else to confirm this in the recent builds to see if it's
still there, but in GIMP 2.8.8, I've found a small issue (tested on Windows

Using the following arrangement of layers and parent-layers (GroupLayers),
users can make the processor chug, and may experience unexpected behavior.
Below, the prefix (X) means unlinked, and (L) will mean linked.

__[root image]
(X)+--------BIG GROUP
(L)+--------+--------LITTLE GROUP
(L)+--------+--------+--------LITTLE LAYER ONE
(L)+--------+--------+--------LITTLE LAYER TWO
(L)+--------+--------+--------LITTLE LAYER THREE
(X)+--------+--------BIG BACKGROUND LAYER

Upon using the move-tool on any "grabbable" pixel of a linked layer (via
move's "Pick a Layer or Guide" option), and trying to drag in some
direction, the linked layers will drift apart or reset to arbitrary
positions, independent of eachother.

This is contrary to the way that linked layers should behave, and ostensibly
uses unnecessary processing as well, as program stability and responsiveness
seems to decrease as this action is performed. This is probably an artifact
from before GroupLayer was an option, back when all layers in link-mode
could be handled uniformly.

To resolve this issue, I imagine checking for contained-by and contains
relationships, and doing more work when the user sets or unsets the "link"
option for layers would solve the problem. If this operation takes
noticeable time, it could be done first either when a transformation
involving the linked layers occurs, or when the dockable Layers-pane looses
focus following a period of link-toggling by the user there. It might remain
stored until a delete or link-settings change occurs again.


For the record, I've added this to the tracker via at
Report includes a file which should allow the error to be recreated.

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