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Add support for soft-edged drop shadows on text in presentations #69

Description

@higheraims

Description:
Euro-Office currently lacks support for soft-edged (blur) drop shadows on text in PowerPoint presentations. This is a commonly-used feature in PPTX files, particularly for improving text contrast against variable backgrounds.

Current behavior: Soft-edge shadow parameters are parsed but not rendered; text appears without the intended shadow effect.

Expected behavior: Text shadows should render with configurable blur/softness, matching PowerPoint output.

Affected components:

  • sdkjs: Shadow rendering logic

  • Possibly core: PPTX shadow parameter parsing (if not already complete)

Related issue: OnlyOffice issue #389 (text shadow feature request)

Test case: See attached PPTX with text featuring soft-edged drop shadows

Text with Drop Shadow.pptx

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