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Upgrade note regarding tile rendering

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Tim Schaub
2016-05-19 09:17:23 -06:00
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changelog/upgrade-notes.md
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## Upgrade notes
#### Rendering change for tile sources
Previously, if you called `source.setUrl()` on a tile source, all currently rendered tiles would be cleared before new tiles were loaded and rendered. This clearing of the map is undesirable if you are trying to smoothly update the tiles used by a source. This behavior has now changed, and calling `source.setUrl()` (or `source.setUrls()`) will *not* clear currently rendered tiles before loading and rendering new tiles. Instead, previously rendered tiles remain rendered until new tiles have loaded and can replace them. If you want to achieve the old behavior (render a blank map before loading new tiles), you can call `source.refresh()` or you can replace the old source with a new one (using `layer.setSource()`).
#### Move of typedefs out of code and into separate file
This change should not affect the great majority of application developers, but it's possible there are edge cases when compiling application code together with the library which cause compiler errors or warnings. In this case, please raise a GitHub issue. `goog.require`s for typedefs should not be necessary.