[gnome-shell/wip/carlosg/pad-osd-labels] padOsd: Figure out label/edition UI positions from unchanged fonts

[Carlos Garnacho <carlosg src gnome org>]

commit 3b1e53bf2577f616a34e1597e47f9fd9d355c089
Author: Carlos Garnacho <carlosg gnome org>
Date:   Sat Apr 30 14:09:37 2022 +0200

    padOsd: Figure out label/edition UI positions from unchanged fonts
    
    We can figure out the position to render the text without resorting to
    font sizes that make the whole text element sub-pixel size. As the
    original labels in the SVG are themed invisible anyway, calculate the
    button/ring/strip label and configuration UI position from their unchanged
    size/location.
    
    Closes: https://gitlab.gnome.org/GNOME/gnome-shell/-/issues/5415

 data/theme/pad-osd.css |  1 -
 js/ui/padOsd.js        | 18 +++++++++---------
 2 files changed, 9 insertions(+), 10 deletions(-)
---
diff --git a/data/theme/pad-osd.css b/data/theme/pad-osd.css
index 31c2377228..e0c904847a 100644
--- a/data/theme/pad-osd.css
+++ b/data/theme/pad-osd.css
@@ -19,7 +19,6 @@
 .Label {
     stroke: none !important;
     stroke-width: .1 !important;
-    font-size: .1 !important;
     fill: transparent !important;
 }
 
diff --git a/js/ui/padOsd.js b/js/ui/padOsd.js
index d0cbbe0e2f..e1e24f70cb 100644
--- a/js/ui/padOsd.js
+++ b/js/ui/padOsd.js
@@ -485,23 +485,23 @@ var PadDiagram = GObject.registerClass({
         if (this._handle == null)
             return [false];
 
-        let leaderPos, leaderSize, pos;
-        let found, direction;
-
-        [found, pos] = this._handle.get_position_sub(`#${labelName}`);
-        if (!found)
+        const [labelFound, labelPos] = this._handle.get_position_sub(`#${labelName}`);
+        const [, labelSize] = this._handle.get_dimensions_sub(`#${labelName}`);
+        if (!labelFound)
             return [false];
 
-        [found, leaderPos] = this._handle.get_position_sub(`#${leaderName}`);
-        [found, leaderSize] = this._handle.get_dimensions_sub(`#${leaderName}`);
-        if (!found)
+        const [leaderFound, leaderPos] = this._handle.get_position_sub(`#${leaderName}`);
+        const [, leaderSize] = this._handle.get_dimensions_sub(`#${leaderName}`);
+        if (!leaderFound)
             return [false];
 
-        if (pos.x > leaderPos.x + leaderSize.width)
+        let direction;
+        if (labelPos.x > leaderPos.x + leaderSize.width)
             direction = LTR;
         else
             direction = RTL;
 
+        let pos = {x: labelPos.x, y: labelPos.y + labelSize.height};
         if (this.leftHanded) {
             direction = 1 - direction;
             pos.x = this._imageWidth - pos.x;