Josm very slow when the view is outside an imagery limit

[StephaneP]

What steps will reproduce the problem?

1. Load some data around an imagery limit
2. Load the imagery
3. Move the view

What is the expected result?

Normal view scrolling

What happens instead?

very slow scrolling

Please provide any additional information below. Attach a screenshot if possible.

You can use the attached Josm session.
It's even slower with the Potlatch paint style.

Revision: 8487
Repository Root: http://josm.openstreetmap.de/svn
Relative URL: ^/trunk
Last Changed Author: Don-vip
Last Changed Date: 2015-06-11 01:00:43 +0200 (Thu, 11 Jun 2015)
Build-Date: 2015-06-11 01:32:10
URL: http://josm.openstreetmap.de/svn/trunk
Repository UUID: 0c6e7542-c601-0410-84e7-c038aed88b3b
Last Changed Rev: 8487

Identification: JOSM/1.5 (8487 fr) Windows 8.1 64-Bit
Memory Usage: 625 MB / 5461 MB (463 MB allocated, but free)
Java version: 1.8.0_45, Oracle Corporation, Java HotSpot(TM) 64-Bit Server VM
Program arguments: [--debug]
Dataset consistency test: No problems found

Plugins:
- DirectUpload (31241)
- OpeningHoursEditor (31241)
- PicLayer (31241)
- cadastre-fr (31241)
- commons-imaging (31241)
- continuosDownload (1413902943)
- download_along (31241)
- editgpx (31241)
- geotools (31126)
- jts (31126)
- opendata (31241)
- photo_geotagging (31241)
- reverter (31241)
- tag2link (31241)
- todo (29154)
- turnrestrictions (31241)
- utilsplugin2 (31241)

Last errors/warnings:
- E: Impossible de trouver l'image "icons/power_tower_low.n.16.png"
- E: Impossible de trouver l'image "icons/power_tower_low.n.16.png"
- E: Impossible de trouver l'image "icons/power_tower_low.n.16.png"
- E: Impossible de trouver l'image "icons/power_tower_low.n.16.png"
- E: Impossible de trouver l'image "icons/power_tower_low.n.16.png"

[stoecker]

What's an imagery limit?

[StephaneP]

The boundary of the imagery layer.
Bing's imagery is covering all the earth, but it's not always the case, like the one used in the attached session.
The "Loire-Atlantique - Orthophotos 2012" imagery covers only a county.

[wiktorn]

In 8488/josm:

Properly handle situation, when tile server returns something else than image file but still gives http status code 200 (like html error page). Closes #11553

[wiktorn]

In 8488/josm:

Properly handle situation, when tile server returns something else than image file but still gives http status code 200 (like html error page). Closes #11553

[StephaneP]

Wow ! That was fast !
It's ok with the 8488 release.

Thank you dear devs !