Inputs: SetItemKeyOwner(): return true if ownership has been requested, which can to be checked to accurately gate further input test.

(#456, #2637, #2620, #2891, #3370, #3724, #4828, #5108, #5242, #5641)

docs/CHANGELOG.txt

@@ -152,6 +152,10 @@ Other Changes:
     items straying out of columns boundaries. (#7994, #2221)
   - Box-Select + Tables: fixed an issue when calling `BeginMultiSelect()` in a table
     before layout has been locked (first row or headers row submitted). (#8250)
+- Inputs:
+  - SetItemKeyOwner(): return true if ownership has been requested, which typically
+    needs to to checked for gating further tests. This is important as the function
+    may fail. (#456, #2637, #2620, #2891, #3370, #3724, #4828, #5108, #5242, #5641)
 - Style:
   - Fixed vertical scrollbar top coordinates when using thick borders on windows
     with no title bar and no menu bar. (#9366)