render caching places map in wrong place when re-enabling

[qgib]

Author Name: Steven Mizuno (Steven Mizuno)
Original Redmine Issue: 2302
Affected QGIS version: master
Redmine category:map_canvas

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simple steps to reproduce with new project:

1. caching ON

2. load map layer

3. caching OFF

4. pan map a noticeable amount

5. caching ON

-- the map is drawn at its original location (when loaded) AND reading the cursor location is wrong since the map extents set by the panning haven't changed.

6. caching OFF

-- now the map is drawn at the previously panned location and reading the cursor location is correct.

I believe the cached map should be invalidated (dump the cache) when caching is turned off, hence the map will be totally re-drawn when caching is enabled.

[qgib]

Author Name: Giovanni Manghi (@gioman)

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confirmed with under Ubuntu linux.

[qgib]

Author Name: Giovanni Manghi (@gioman)

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• fixed_version_id was changed from Version 1.7.0 to Version 1.7.4

[qgib]

Author Name: Paolo Cavallini (@pcav)

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• crashes_corrupts_data was configured as 0
• version was configured as master
• fixed_version_id was changed from Version 1.7.4 to Version 1.8.0

[qgib]

Author Name: Paolo Cavallini (@pcav)

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• fixed_version_id was changed from Version 1.8.0 to Version 2.0.0

[qgib]

Author Name: Giovanni Manghi (@gioman)

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In qgis master this does not happen anymore.

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• pull_request_patch_supplied was configured as 0
• assigned_to_id removed nobody
• resolution was configured as fixed/implemented
• status_id was changed from Open to Closed