Cache the last created temporary handles at a requested size #2601
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Cache the most recently created temporary handle. When a handle of a different size is requested, dispose of the previous one and replace it with the new handle. The last cached handle is also destroyed when the image is disposed.
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When rendering images at a specific targetSize, the most recently created temporary handle is cached. If a handle of a different size is needed, the previous handle is disposed of and replaced with the new one. The last cached handle is also disposed of when the image itself is destroyed.
This change does not affect the visual appearance and is purely an optimization. It is especially useful when a user scrolls through a diagram, as the same-size image may be redrawn multiple times. Without handle caching, new image handles would need to be created repeatedly whenever the image is redrawn. More details can be found at vi-eclipse/Eclipse-Platform#326 (comment)