Don't re-measure when the shift key is being pressed while a token is following the currently active ruler

CHANGELOG.md

@@ -7,6 +7,7 @@
 
 ### Bugfixes
 - Fixed a bug that sometimes measured diagonals incorrectly with the 5/10/5 grid rule
+- Fixed a bug that would cause the ruler to re-measure when the shift key is being pressed or released while a token is moving
 
 ### Compatibility
 - Drag Ruler's Generic Speed Provider is now aware of good default values for the Starfinder game system

src/main.js

@@ -115,6 +115,8 @@ function onKeyShift(up) {
 	const ruler = canvas.controls.ruler
 	if (!ruler.isDragRuler)
 		return false
+	if (ruler._state !== Ruler.STATES.MEASURING)
+		return false;
 
 	const mousePosition = canvas.app.renderer.plugins.interaction.mouse.getLocalPosition(canvas.tokens)
 	const rulerOffset = ruler.rulerOffset