Hi Daxanius,
I just noticed that when using the column select mode (ALT + SHIFT + Arrow key), if the text extends past the visible display area, the control should scroll down to show the last selected roll as you scroll past the bottom of the visible area. The attached MP4 video shows the expected behavior. Note: I used the Scintilla editor as an example of how it should work.
John
Example using Scintilla
https://github.com/Daxanius/FastColoredTextBox/assets/5770595/431f5c02-2e5f-4f35-a34b-029be87c42fa
Example using FCTB
https://github.com/Daxanius/FastColoredTextBox/assets/5770595/4521ede7-c945-4f0b-b241-914091f5c9b8