Language bar: dragging and dropping glyphs only works once!

[FionaDyalog]

Describe the issue you are having

Language bar: dragging and dropping glyphs only works once!

Did you connect to an already running interpreter or start the interpreter from RIDE?

Connected

How do you reproduce the issue?

Open RIDE, drag an drop a glyph in the language bar - success. Try to do it again - failure.

Paste the contents of Help → About (Shift+F1)

IDE:
Version: 4.0.2836
Platform: Win32
Date: 2017-06-27 14:11:02 +0100
Git commit: 2b8dba4
Preferences:{
"kbdLocale":"en_US",
"lineNums":"0",
"selectedExe":"C:\Program Files\Dyalog\Dyalog APL-64 15.0 Unicode\dyalog.exe",
"wse":"1",
"zoom":"-1",
"lbarOrder":"← +-×÷*⍟⌹○!? |⌈⌊⊥⊤⊣⊢ =≠≤<>≥≢ ∨∧⍲⍱ ≡↑↓⊂⊃⊆⌷⍋⍒ ⍳⍸∊⍷∪∩~ /\⌿⍀ ,⍪⍴⌽⊖⍉ ¨⍨⍣.∘⍤@ ⍞⎕⍠⌸⌺⌶⍎⍕ ⋄⍝→⍵⍺∇& ¯⍬"
}

Interpreter:
Version: 16.0.30307
Platform: Windows-64
Edition: Unicode/64
Date: Jul 5 2017 at 20:34:46

[jayfoad]

Broken by 67c3a3c