Merge pull request livecode#7240 from bwmilby/bwm-bugfix-22509

[Bug 22509] Tree View Widget crash

Author: livecodepanos

extensions/widgets/treeview/notes/22509.md

@@ -0,0 +1 @@
+# [22509] Ensure null `mEllipsisLength` does not cause widget to crash

extensions/widgets/treeview/treeview.lcb

@@ -1542,6 +1542,7 @@ end handler
 -- This happens when the separator is moved, font/icon sizes change,
 -- and when the ReadOnly property changes.
 private handler updateSeparator() returns nothing
+ensureEllipsis()
 if mReadOnly then
 put 2 * kItemPadding + mIconWidth into mRightIconMargin
 else
@@ -2632,8 +2633,6 @@ end handler
 -- the portion of the string that can fit, and sets rTrimmed if the string was trimmed.
 -- There should always be space for an ellipsis after a key when there is a value.
 private handler displayWidth(in pText as String, in pSpace as Real, out rText as String, out rTrimmed as Boolean) returns Real
-ensureEllipsis()
-
 variable tCount as Number
 variable tCurrentString as String
 variable tChar as String