Properly handle EnterMode=br and block formatting

[FredCK]

When EnterMode='br', we must properly handle the formatting of the blocks (block element change) with the "Format" toolbar combo.

Every line separated by a <br> must be considered a "block", and therefore only that part must be changed when switching block type. Also, if a selection embraces a <br>, the entire selection must be broken in different blocks.

Today, the entire block is changed to the selected block style. To test it:

• Set EnterMode='br'
• Type some lines of text
• Position the cursor over one of the lines
• Switch the format to Heading 1 -> The entire block will be transformed

[fredck]

Fixed with [811].

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