User scenarios of text grid

The following user scenarios of text grid are under investigation.

1. When user creates a text document, the default paper mode of text grid is read from user preference settings. User can switch the default paper mode of text grid in text document options tab page. (Tools --> Options --> Text Document --> General) by clicking the check box "Use squared paper mode for text grid".

2. When import a Ms Word 97/2000 file (.doc), the default paper mode is treated as "standard paper mode".

3. When import a text document of the previous version of OO.org (.odt, .sxw), the default paper mode is treated as "squared paper mode"

4. When user is editing a text document with text grid.
if he switchs the paper mode from "squared" to "standard", the following behavior is used:
* line height = Max base text size + Max ruby text size
* lines per page = type area height / line height
* Max ruby text size = 0

if he switch the paper mode from "standard" to "squared", the following behavior is used:
* line height = type area height / lines per page
* Max base text size = line height * 2 / 3
* Max ruby text size = line height / 3