fix: the download failed after uploading an SVG icon

[lkwavestian]

Mainly for fix #42 .

When I upload my own svg icon and click download button，the button remains in the loading state and the download fails with an error：

This error is mainly because dom-to-image cannot handle when dom contains svg img, here is the detail dom-to-image/issues/266.

dom-to-image-more can solve the problem.

But when I use dom-to-image-more, the downloaded image has a border:

I’m not completely certain about the original intention behind adding a border to the CoverImage. However, to ensure the stability of the existing logic, I decided to use a trick: add the class name to the DOM before generating the image, and remove it after generating the image.

The main code is element.classList.add("export-mode") and element.classList.remove("export-mode")

Try again

Success!

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