#1194 Preserve indicators when moving lines up/down

[Vasiliy Faronov]

Currently, SCI_MOVESELECTEDLINESUP and SCI_MOVESELECTEDLINESDOWN cause any indicator ranges inside the text to be cleared.

To reproduce in SciTE:

1. Add this to an options file:

   user.shortcuts=Alt+Down|2621| # SCI_MOVESELECTEDLINESDOWN
   

2. Restart SciTE.

3. Type the following text:

   hello
   world
   

4. Invoke Search → Find.

5. In the Find field, type: e
6. Click Mark All. The letter e in the first line is highlighted with an indicator.
7. With the cursor on the first line, press Alt+Down. The first line is moved down, and as a side effect, the highlighting disappears.

Intuitively, moving a block of text should not change things that are entirely contained within it.

I think it would be better to preserve indicator ranges in this case, if possible.

[Neil Hodgson]

Indicators do not stick to text that has been moved or copied. Mark All produces a snapshot result and does not attempt to maintain those indicators.