id	summary	reporter	owner	description	type	status	priority	milestone	component	version	resolution	keywords	cc
8757	Display one window when merging multiple layers	emj	team	"This is a minor issue, that really doesn't need fixing unless someone wants an ""easy"" project or scratch an itch. 

Steps to reproduce:
1. get 10 big datalayers in JOSM
2. select all layer in selection window pane
3. press merge (into some layer)

result 
1. a window will open to merge a layer
2. that window will be activated
3. That window closes
4. go to step 1 until all layers are merged  (takes about 30 seconds here).


Expected result:
Being able to surf the web while JOSM merges layers, not having a new window pop up every so often.

Some thing like this:
1. a window will open to merge all layers in one go
2. that window will be activated
3. merge all layers (takes about 30 seconds here).
"	enhancement	new	trivial		Core