[Geany] column mode freezes geany

[Vineet Jain]

Over a larger area, the column mode will freeze all of Geany to a point
where I have a to kill the program.

Steps to reproduce:

1. take a text file over 10k rows
2. change to column mode
3. highlight the first column and keep pressing page down
4. after about the 4k row geany becomes progressively unresponsive
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