Link to issue number:

Fixes #12004

Summary of the issue:

When reading a text in a browseable message (such as formatting information) line by line pressing down arrow, there is one blank line between each line of text.

Description of how this pull request fixes the issue:

• Modified the HTML message template to use only innerHTML attribute and not innerText anymore.
• The raw text formatting is done in Python code by adding <pre> tag and escaping < character.

Testing performed:

• Tested with formatting info message, with "Hello world" message in raw text.
• Tested HTML message with Character information add-on.
• Tested long raw text (1000000 character) with Clip Contents Designer from @nvdaes and @abdel792.
  Incidentally, this PR also fixes a visual issue in raw text browseable message containing lines longer than the window: moving the cursor on blank lines would pane the whole text to its right-most position, making the beginning of the lines disappear. This was visually strange. This is not the case anymore with this PR since the unexpected blank lines have been removed.

Known issues with pull request:

None.

Change log entry:

Bug fixes!
Formatting information and other browseable messages do not present unexpected blank lines anymore. (#12004)