Allow more items in automatic width calculation for TextEdit completion
Allow more items in automatic width calculation for TextEdit completion

Calculating the width for 100 items takes a millisecond in
a debug build on an i7-6700K. It's likely that the editor can remain
smooth even with 1,000 items, especially in a release build.

ex/godot,ex/godot,ex/godot,ex/godot,ex/godot,ex/godot,ex/godot,ex/godot