[LBSE] Computation of on-screen font scaling factor ignores page zoom

https://bugs.webkit.org/show_bug.cgi?id=258120

Reviewed by Rob Buis.

For standalone SVG documents the page zoom has to be taken into account when computing the
on-screen font scaling factor. Currently we ignore the effective zoom factor and thus select
a sub-optimal font.

Non-scaling-stroke (webkit.org/b/139322) works properly in LBSE, if this fix is applied as well.
Two tests fail in LBSE without this patch: svg/text/non-scaling-stroke-textRendering-default.svg
and svg/text/non-scaling-stroke-textRendering-geometricPrecision.svg).

Covered by new tests added by webkit.org/b/139322 -- easy to test with non-scaling-stroke.
Without non-scaling-stroke, this is most noticeable in zoom-zoom-coords.html which now
exposes slighly different metrics for <text> since the internal font-size scaling factor
changed (now taking zoom into account, as the legacy SVG engine already does).

zoom-zoom-coords.xhtml now delivers correct results across all platforms and is identical
for legacy SVG engine and LBSE -- get rid of platform specific results, finally.

* LayoutTests/platform/glib/svg/zoom/page/zoom-zoom-coords-expected.txt: Removed.
* LayoutTests/platform/mac-ventura-wk2-lbse-text/svg/zoom/page/zoom-zoom-coords-expected.txt: Removed.
* LayoutTests/platform/mac/svg/zoom/page/zoom-zoom-coords-expected.txt: Removed.
* LayoutTests/svg/zoom/page/zoom-zoom-coords-expected.txt:
Finally a single non-LBSE/LBSE result for all platforms.
* LayoutTests/svg/zoom/page/zoom-zoom-coords.xhtml:
* Source/WebCore/rendering/svg/SVGLayerTransformComputation.h:
(WebCore::SVGLayerTransformComputation::calculateScreenFontSizeScalingFactor const):
Multiply scaling factor by effectiveZoom() (which includes page zoom), but only for non-standalone
SVG documents. For standalone SVG documents the page-zoom induced scaling is already part of the CTM.

Canonical link: https://commits.webkit.org/265208@main

LayoutTests/svg/zoom/page/zoom-zoom-coords-expected.txt

@@ -53,11 +53,11 @@ PASS image1.height.toFixed(2) is "25.00"
 PASS image1.right.toFixed(2) is "150.00"
 PASS image1.bottom.toFixed(2) is "275.00"
 PASS text1.left.toFixed(2) is "100.00"
-PASS text1.top.toFixed(2) is "282.66"
+PASS text1.top.toFixed(2) is "282.58"
 PASS text1.width.toFixed(2) is "49.20"
 PASS text1.height.toFixed(2) is "6.16"
 PASS text1.right.toFixed(2) is "149.20"
-PASS text1.bottom.toFixed(2) is "288.82"
+PASS text1.bottom.toFixed(2) is "288.73"
 
 PASS svg2.left.toFixed(2) is "75.00"
 PASS svg2.top.toFixed(2) is "100.00"
@@ -78,11 +78,11 @@ PASS image2.height.toFixed(2) is "25.00"
 PASS image2.right.toFixed(2) is "225.00"
 PASS image2.bottom.toFixed(2) is "125.00"
 PASS text2.left.toFixed(2) is "175.00"
-PASS text2.top.toFixed(2) is "132.66"
+PASS text2.top.toFixed(2) is "132.75"
 PASS text2.width.toFixed(2) is "47.44"
 PASS text2.height.toFixed(2) is "5.94"
 PASS text2.right.toFixed(2) is "222.44"
-PASS text2.bottom.toFixed(2) is "138.60"
+PASS text2.bottom.toFixed(2) is "138.69"
 
 PASS svg3.left.toFixed(2) is "900.00"
 PASS svg3.top.toFixed(2) is "500.00"
@@ -103,11 +103,11 @@ PASS image3.height.toFixed(2) is "50.00"
 PASS image3.right.toFixed(2) is "1200.00"
 PASS image3.bottom.toFixed(2) is "550.00"
 PASS text3.left.toFixed(2) is "1100.00"
-PASS text3.top.toFixed(2) is "565.33"
+PASS text3.top.toFixed(2) is "565.16"
 PASS text3.width.toFixed(2) is "98.41"
 PASS text3.height.toFixed(2) is "12.31"
 PASS text3.right.toFixed(2) is "1198.41"
-PASS text3.bottom.toFixed(2) is "577.64"
+PASS text3.bottom.toFixed(2) is "577.47"
 
 PASS successfullyParsed is true