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shaped-texture: Fix damage propagation for rotated transforms with viewport

Robert Mader requested to merge rmader/mutter:fix-viewports-with-transforms-2 into master

When a viewport source rect or destination size is set, stex->dst_width gives us the the cropped and/or scaled size. At this step, we need the uncropped/unscaled size however.

Note: this is only ever relevant if buffer transform and viewport are used together - otherwise the values are the same.

How to test:

  • For once the new in-development Firefox backend (https://bugzilla.mozilla.org/show_bug.cgi?id=1699985), which behaves like Weston with this patch
  • For the rotated cases:
    • Apply !1055 (merged)
    • change the weston-simple-damage client: comment out the wp_viewport_set_source line
    • run it with e.g. weston-simple-damage --use-viewport --use-damage-buffer --transform=90

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