fix: remove rounding to fix jitter when shift-editing (#5543)

Co-authored-by: Ryan Di <ryan.weihao.di@gmail.com>

src/element/linearElementEditor.ts

@@ -178,17 +178,13 @@ export class LinearElementEditor {
         const referencePoint =
           element.points[selectedIndex === 0 ? 1 : selectedIndex - 1];
 
-        let [width, height] = LinearElementEditor._getShiftLockedDelta(
+        const [width, height] = LinearElementEditor._getShiftLockedDelta(
           element,
           referencePoint,
           [scenePointerX, scenePointerY],
           appState.gridSize,
         );
 
-        // rounding to stop the dragged point from jiggling
-        width = Math.round(width);
-        height = Math.round(height);
-
         LinearElementEditor.movePoints(element, [
           {
             index: selectedIndex,